Update by @unknown on 26/Apr/2017: This bug has been fixed in 1.0.5.0. If you are still having issues with entities apparently disappearing, see the separate issues MCPE-1982 (Mobs and NPCs Can Escape Enclosures) and MCPE-21416 (Entities can despawn when entering/exiting the Nether (multiplayer)). Also, keep in mind that entities that have never been interacted with are SUPPOSED to despawn. When testing either of the aforementioned 2 bugs, please make sure to interact with the entities you're observing first. If the entity ever sets you as its target, follows you, or gets fed/bred/punched/etc. by you, that counts as an interaction.
Original description:
First pic is of the cow-farm; every powered rail had a cow in a minecart...somehow two whole rows disappeared completely, without a trace of the minecarts or cows.
Next two are pictures of the underground villiage where despawning villiagers were supposed to go.
The rest after that would be some of the villiagers' holding cells where they are staying until the villiage is done and the villiagers are capable of door-opening and breeding and wont just stand right at a door while zombies smack them through it. You can see where some of the villiager cells clearly weren't wrecked by me releasing them, yet there is no villiager...and no way that a zombie could've reached it. There was only ever 19 villiagers, so it isn't like somehow a siege happened and zombies spawned right next to them.
Also, random sheep that are individually fenced off and within a larger structure, despawned randomly for no apparent reason as well. Same goes for another animal farm that was just a bunch of chickens and cows and pigs in a room underground.
Villagers also dissapears after visiting the nether. (From MCPE-9662)
Villagers dissapear while away in easyest difficult (From MCPE-9690)
Villagers dissapear when flying too high (From MCPE-10219)
Update by @unknown on 03/Dec/2015
Thank you for all the comments. We reported this bug for further testing and hopefully it will be resolved in the future.
This is a VERY complex issue, we have been looking into for quite some time. It is not easy to reproduce and easily fix. It is also very inconsistent and therefore we are unable to fix it right away.
Just a reminder - We are currently using internal tool to test and assign bugs, so we do not assign bugs to developers in JIRA, it doesn't mean we are ignoring them.
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I REEEAAALLLLLLYYY am finding this to be a severe bug!

I REEEAAALLLLLLYYY am finding this to be a severe bug!

This bug is really annoying. Please fix it.

This bug is really annoying. Please fix it.

Plz fix

Plz fix

Does this still apply in 0.11.1?

Does this still apply in 0.11.1?

Sorry, I was having trouble accessing my account...But, Sadly this still is happening. Still have the same device. Mcpe version 0.11.1, iOS version 8.4

Sorry, I was having trouble accessing my account...But, Sadly this still is happening. Still have the same device. Mcpe version 0.11.1, iOS version 8.4

So I've been building a large village in creative mode, low difficulty, so no monsters, villagers were all contained, but they kept disappearing. Started a new world just to experiment with this. Put 20 villagers together in open box in mid air, walls three spaces high, floorspace 8 x 8, put a second bigger box beneath the first box. Watched it for a while, nothing changed. Left the area (beyond render distance), came back, still 20 villagers, repeat, repeat, repeat, always find 20. Closed the world, opened my main world, played for a while, switched back to my test world, flew over to the box, counted the villagers, could only find 19. Checked all around, lower box, ground level, etc. No missing villager anywhere to be found. Exit, play main world, exit, load test world, count the villagers - 18! still can't find the missing villagers. Hover directly over the test box, exit, reload test world, watch villagers inside the box closely - one of them walked straight inside the wall, struggled for a bit, and then poof, no more villager, count was down to 17. Moved to directly over the wall, exited again, reloaded test world again, watched from directly on top of the wall as two more villagers walked all the way inside the dirt wall, got stuck, and died! Haven't seen any fall through the floor yet.
So apparently vertical surfaces are permeable as the game loads, and mobs begin moving around before the walls become solid, causing them to get stuck inside and die.
So I can see one of two fixes being possible. One, vertical surfaces are somehow forced to solidify before mobs load/move. Two, "solids" expel mobs that end up inside them before the mob takes damage. Not a programmer, so I have no idea which would be better or easier solution to program. Anyone else see a different solution?
iphone 4s, ios 7.1.2, mcpe 0.11.1

Win 10 edition have this bug too.
Bug inside since 26/Feb/15.
Labels: None
Confirmation Status: Unconfirmed.
Still no fix or even working on it.

Win 10 edition have this bug too.
Bug inside since 26/Feb/15.
Labels: None
Confirmation Status: Unconfirmed.
Still no fix or even working on it.

Hate this bug. It's just annoying.

Hate this bug. It's just annoying.

I updated to 0.12.1 alpha a day or so ago and started a completely new world to play with this some more. Built a bunch of 1x3 cells with one villager in each and had no deaths, so I started to hope it was fixed. Built some bigger cells 2x3, 3x3, 4x3, 5x3 and spawned 2, 3, 4, 5 villagers per cell and started have deaths with each load of this new world. Same phenomenon, villagers load, some end up moving inside the walls and die, but only in the cells with more than one villager. In one case a villager got shoved all the way through the wall into the next cell. In another, a villager apparently jumped as he entered the wall and stopped one block higher than the floor, waist down he was inside the wall, waist up he was above the top of the wall; the part that was outside rendered all black, eventually he made another jump straight up and escaped without damage, and returning to normal colorization.

To me its became worser whit the 0.12.1.
Just started a new world and the entire village died while the map was generated (sometimes i hear their damage and death cry). 8/10 times start whit an empty village.
And its not just when i load or generate a new map. If i goo too far from the village and came back there is less villager since last time.

To me its became worser whit the 0.12.1.
Just started a new world and the entire village died while the map was generated (sometimes i hear their damage and death cry). 8/10 times start whit an empty village.
And its not just when i load or generate a new map. If i goo too far from the village and came back there is less villager since last time.

Confirmed to effect 0.12.1 on iPhone 6 Plus (iOS 9.0.1). As of this release, I have observed in golems, pets, mobs from spawn eggs, animals, and NPCs, all of which should be persistent.
Note: villages with population zero is MCPE-8443, that being a seperate issue.
I find this bug so annoying!
What a waste of effort when you lose animals/npc's/golems randomly. Farming and breeding is a large part of the game, and is currently pretty pointless :/
Win 10 edition PC - 0.12.1
I find this bug so annoying!
What a waste of effort when you lose animals/npc's/golems randomly. Farming and breeding is a large part of the game, and is currently pretty pointless :/
Win 10 edition PC - 0.12.1

Still a problem in 0.12.3

Still affects 0.13 beta builds. Also I noticed that Villagers have become especially prone to dissapear in the new update (I lost two whole villages in separate worlds. They didn't suffocate or anything, just vanished).

Still affects 0.13 beta builds. Also I noticed that Villagers have become especially prone to dissapear in the new update (I lost two whole villages in separate worlds. They didn't suffocate or anything, just vanished).

Have to agree that this is very annoying. Makes the game almost unplayable. A huge bug.

Have to agree that this is very annoying. Makes the game almost unplayable. A huge bug.

I do not know why this is not fixed. This has got be be the largest bug in the game.

I do not know why this is not fixed. This has got be be the largest bug in the game.

Villagers are still dying inside walls or walking through walls as the world loads in 0.13.0 alpha

The villager despawn part is effecting Windows 10-v13.0 as well

The villager despawn part is effecting Windows 10-v13.0 as well

I think I found a work around if you put everything on a half slap nothing will move, and will not walk through a wall.

I think I found a work around if you put everything on a half slap nothing will move, and will not walk through a wall.

Windows 10 Beta - I have had to reseed my village several times. I have a large house with no doors that held my 30 villagers. I had empty houses with doors. All 30 villagers slowly disappeared. i switched to createive, put in 12 villagers, and they bred up to 30 again, then slowly dwindled to zero. had pig, chicken and cow farms. one day i looked they were full, the next they were completely empty. This is my biggest outstanding issue as well. The villagers aren't a big deal since there isnt trading yet, but the animals are a huge pain.

Windows 10 Beta - I have had to reseed my village several times. I have a large house with no doors that held my 30 villagers. I had empty houses with doors. All 30 villagers slowly disappeared. i switched to createive, put in 12 villagers, and they bred up to 30 again, then slowly dwindled to zero. had pig, chicken and cow farms. one day i looked they were full, the next they were completely empty. This is my biggest outstanding issue as well. The villagers aren't a big deal since there isnt trading yet, but the animals are a huge pain.

i did build a nether around that time but i did notice a few went missing logged out and came back and the rest but 1 disappeared but i cat say it was random spawn or the nether caused it because i hear there are 2 problems around it

i did build a nether around that time but i did notice a few went missing logged out and came back and the rest but 1 disappeared but i cat say it was random spawn or the nether caused it because i hear there are 2 problems around it

Yeah, I've had villagers (and occasionally sheep) drop to severly low numbers and then dissapear for no reason. Seems to be that it's either when you go to the Nether, leave far away from the mobs, or quit and reopen your world. It always is with large amounts of mobs.
BTW still affects 0.13.0 official release.

Yeah, I've had villagers (and occasionally sheep) drop to severly low numbers and then dissapear for no reason. Seems to be that it's either when you go to the Nether, leave far away from the mobs, or quit and reopen your world. It always is with large amounts of mobs.
BTW still affects 0.13.0 official release.

@unknown, didn't you find those villagers wandering out of the chamber? This is what happens to me. They indeed disappear sometimes but they can as well escape from a chamber with no doors, but only when the game is restarted. I'm highly suspecting that this is the same glitch as [MCPE-1982].

@unknown, didn't you find those villagers wandering out of the chamber? This is what happens to me. They indeed disappear sometimes but they can as well escape from a chamber with no doors, but only when the game is restarted. I'm highly suspecting that this is the same glitch as MCPE-1982.

I do have animals and villagers that clip. now that my pens are below ground, they die instead of getting free. I will get a villager on the outside but it is normally a baby that clips when being bred. I think that there could be less clipping, but I believe that it happens mostly when the chunks are being loaded. its not like 100 of each chickens/cows/pigs suddenly all ran to the dirt walls then suffocated. my LAN world does crash, but I haven't attributed any activity to the crashes. I think it probably has to do with lag. I have never gotten any extra XP, but when other people connect to my win10BE world and enter my zombie/skeleton farms, they can kill one skeleton and get anywhere between normal xp and, so far 40 LEVELS of xp from a single kill. if the game cant keep up with all the tracking, maybe that's why it looses track of items and mobs disappear.

I do have animals and villagers that clip. now that my pens are below ground, they die instead of getting free. I will get a villager on the outside but it is normally a baby that clips when being bred. I think that there could be less clipping, but I believe that it happens mostly when the chunks are being loaded. its not like 100 of each chickens/cows/pigs suddenly all ran to the dirt walls then suffocated. my LAN world does crash, but I haven't attributed any activity to the crashes. I think it probably has to do with lag. I have never gotten any extra XP, but when other people connect to my win10BE world and enter my zombie/skeleton farms, they can kill one skeleton and get anywhere between normal xp and, so far 40 LEVELS of xp from a single kill. if the game cant keep up with all the tracking, maybe that's why it looses track of items and mobs disappear.
Thank you for all the comments. We reported this bug for further testing and hopefully it will be resolved in the future.
This is a VERY complex issue, we have been looking into for quite some time. It is not easy to reproduce and easily fix. It is also very inconsistent and therefore we are unable to fix it right away.
Just a reminder - We are currently using internal tool to test and assign bugs, so we do not assign bugs to developers in JIRA, it doesn't mean we are ignoring them.
Thank you for all the comments. We reported this bug for further testing and hopefully it will be resolved in the future.
This is a VERY complex issue, we have been looking into for quite some time. It is not easy to reproduce and easily fix. It is also very inconsistent and therefore we are unable to fix it right away.
Just a reminder - We are currently using internal tool to test and assign bugs, so we do not assign bugs to developers in JIRA, it doesn't mean we are ignoring them.

Villager despawn like hostile mobs, but hostile mobs dont despawn

Villager despawn like hostile mobs, but hostile mobs dont despawn
Update for 0.13.1 (Win 10) - Still despawning randomly. Very annoying.
Update for 0.13.1 (Win 10) - Still despawning randomly. Very annoying.

After transporting a mushroom cow over half the endless map... (well, 4000 blocks at least), it despawned in its assigend perch. This issue can really kill motivation & joy of the game 😞

After transporting a mushroom cow over half the endless map... (well, 4000 blocks at least), it despawned in its assigend perch. This issue can really kill motivation & joy of the game 😞

I've had three villages' populations despawn.

I've had three villages' populations despawn.

Yes, this is definitely a horrible bug. I had been thinking my villagers were falling prey to zombies, so my last world I started, I blocked two up in their house, just in case everyone else got wiped out, they could repopulate. I went to check on them several game days later, and they're gone. House was still blocked up.

Yes, this is definitely a horrible bug. I had been thinking my villagers were falling prey to zombies, so my last world I started, I blocked two up in their house, just in case everyone else got wiped out, they could repopulate. I went to check on them several game days later, and they're gone. House was still blocked up.

Yeah, I had two villages' populations despawn. However, three villagers were left, so were the iron golems..
This is a very severe bug

Yeah, I had two villages' populations despawn. However, three villagers were left, so were the iron golems..
This is a very severe bug

Confirmed on Minecraft: Windows 10 Edition 0.13.1

Confirmed on Minecraft: Windows 10 Edition 0.13.1

Fixed in an upcoming version

Fixed in an upcoming version
Excellent! Can't wait!
Excellent! Can't wait!

😃 So glad

😃 So glad

This update can't get here fast enough. I just had another very large village (golem included) instantly become a ghost town. This and the mob farm spawn problem are hurting me in early game. Anyone heard a release date on 0.14?

This update can't get here fast enough. I just had another very large village (golem included) instantly become a ghost town. This and the mob farm spawn problem are hurting me in early game. Anyone heard a release date on 0.14?

I want to report an issue about the deactivation rail, when placed the game crashes

I want to report an issue about the deactivation rail, when placed the game crashes

Well, 0.14.0 is out on android (beta) but it doesn't work for me 😞
I'm sure it will come out on the other platforms at least in the next month or so, and as it is in betasnd there are testers, there will be less bugs for the upcoming version.

Well, 0.14.0 is out on android (beta) but it doesn't work for me 😞
I'm sure it will come out on the other platforms at least in the next month or so, and as it is in betasnd there are testers, there will be less bugs for the upcoming version.
I give you spoiler. When you change difficulties so many times ( from peaceful-hard,etc), the villager and the iron golem despawn. Because I have my XP farm near the villages.
I give you spoiler. When you change difficulties so many times ( from peaceful-hard,etc), the villager and the iron golem despawn. Because I have my XP farm near the villages.

This still happens on MCPE 0.14.0.
All my animals from my barn disappeared when i relog the game.

This still happens on MCPE 0.14.0.
All my animals from my barn disappeared when i relog the game.

This may be a difficult problem to solve, but the players are dependent on a quick resolution. This is a critical problem for the game in its current configuration. In my opinion, the game is unplayable because this bug is at the center of what makes the game enjoyable.

This may be a difficult problem to solve, but the players are dependent on a quick resolution. This is a critical problem for the game in its current configuration. In my opinion, the game is unplayable because this bug is at the center of what makes the game enjoyable.

@Alan muhl Well, unfortunately, you'll just have to wait. The developers are working diligently to balance out working on bug fixes as well as future updates. Please be patient.

@Alan muhl Well, unfortunately, you'll just have to wait. The developers are working diligently to balance out working on bug fixes as well as future updates. Please be patient.

Also for some reason paintings, signs, ladders, item frames, and torches drop off walls or despawn after a while...

Also for some reason paintings, signs, ladders, item frames, and torches drop off walls or despawn after a while...

Still happening in 0.14.2 , but only happens to pigs, chickens, and signs.

Still happening in 0.14.2 , but only happens to pigs, chickens, and signs.

Playing Windows 10 Edition, all of the villagers disappeared about a week ago. Very few were roaming the nearby forest for a day maybe, now the site of their village it's a ghost town. The village has been there and active since I discovered it last August.
Might be helpful to note that they didn't start disappearing until we moved close to the village to work on a project there. And there's no world backup from before they disappeared.

Playing Windows 10 Edition, all of the villagers disappeared about a week ago. Very few were roaming the nearby forest for a day maybe, now the site of their village it's a ghost town. The village has been there and active since I discovered it last August.
Might be helpful to note that they didn't start disappearing until we moved close to the village to work on a project there. And there's no world backup from before they disappeared.
This issue also affects 0.14.3
This issue also affects 0.14.3

Still Affects 0.14.3 - iPod Touch 6th Generation
This applies to both passive, hostile, and block entities.

Still Affects 0.14.3 - iPod Touch 6th Generation
This applies to both passive, hostile, and block entities.

Affects 0.15.0.0 much worse than 0.14.3
Steps to reproduce:
Step 1: put two or more entities in a fence
Step 2: walk approx. 128 blocks away
Step 3: Stay 128 blocks away from the two entities for around 10 mins
Step 4: restart the game
Step 5: walk back to entities and there seems to be a high chance of despawn. (Applies to all mobs)

Affects 0.15.0.0 much worse than 0.14.3
Steps to reproduce:
Step 1: put two or more entities in a fence
Step 2: walk approx. 128 blocks away
Step 3: Stay 128 blocks away from the two entities for around 10 mins
Step 4: restart the game
Step 5: walk back to entities and there seems to be a high chance of despawn. (Applies to all mobs)

My horses despawn like so as well. Except it happens when the server crashes on Realms. I am either ruding the horse when the game crashes, near a horse, or not even in the same chunk. This issue also applies to horses with that have been named via Nametag.

My horses despawn like so as well. Except it happens when the server crashes on Realms. I am either ruding the horse when the game crashes, near a horse, or not even in the same chunk. This issue also applies to horses with that have been named via Nametag.

Yes this has happened with my horses that I put in a stable. Enclosed. They despawn from the realm. With armour and a saddle on. Or they get out of their area and are in the main part of the stable. Or if the realm crashes and I'm riding my horse, it will be 10 to 20 blocks away. Also my dogs despawn, they maybe some where in the realm but haven't found them yet.

Yes this has happened with my horses that I put in a stable. Enclosed. They despawn from the realm. With armour and a saddle on. Or they get out of their area and are in the main part of the stable. Or if the realm crashes and I'm riding my horse, it will be 10 to 20 blocks away. Also my dogs despawn, they maybe some where in the realm but haven't found them yet.

Confirmed: (Realm game). Same thing, a horse despawned wearing all it's armor along with about 25 cows, 10 sheep, and 30 or so chickens all de-spawned at once. This may be related to nether portals, dying in nether and re-spawning near the animal pens. Does this seem related to nether entry / exit to anyone else?

Confirmed: (Realm game). Same thing, a horse despawned wearing all it's armor along with about 25 cows, 10 sheep, and 30 or so chickens all de-spawned at once. This may be related to nether portals, dying in nether and re-spawning near the animal pens. Does this seem related to nether entry / exit to anyone else?

no it's a different problem i had animals despawn near me might have either walked to far about the lenght of of a minecraft maps 2/4 size maps and about 1 and 1/2 of a map or when I loaded the game

no it's a different problem i had animals despawn near me might have either walked to far about the lenght of of a minecraft maps 2/4 size maps and about 1 and 1/2 of a map or when I loaded the game

Now I understood. The problem is related to the loading of chunks. Sometimes when you enter the game chunks generation has got a bug and entities are FREE TO MOVE everywhere for a while. I tried to attract chickens with seeds and they PASS THE FENCES while chunks were genereting. Please mojang fix it ASAP because it's a very noisy problem!!!!

Now I understood. The problem is related to the loading of chunks. Sometimes when you enter the game chunks generation has got a bug and entities are FREE TO MOVE everywhere for a while. I tried to attract chickens with seeds and they PASS THE FENCES while chunks were genereting. Please mojang fix it ASAP because it's a very noisy problem!!!!

Would that affect the villagers as well, then? Unless the village borders are treated like walls for the villagers, it's not the same problem.

Would that affect the villagers as well, then? Unless the village borders are treated like walls for the villagers, it's not the same problem.

i'm not sure about the animals going through fences but that could explain why animals and npcs disappear like if mobs never regenerated when the chunks load back up

i'm not sure about the animals going through fences but that could explain why animals and npcs disappear like if mobs never regenerated when the chunks load back up

Mobs don't disappear, they only escape from their place and when you load the world sometimes you find them out.

Mobs don't disappear, they only escape from their place and when you load the world sometimes you find them out.

I could see the villagers roam the nearby forest for a while when they started disappearing (they didn't go all at once, it took a few real world days). Now they're nowhere to be seen. So, I'm not sure if they despawned totally or just roamed away, brainless.

I could see the villagers roam the nearby forest for a while when they started disappearing (they didn't go all at once, it took a few real world days). Now they're nowhere to be seen. So, I'm not sure if they despawned totally or just roamed away, brainless.

Please mojang do something. The game is UNPLAYABLE right now

Please mojang do something. The game is UNPLAYABLE right now

It's not just me then. I had our fields, each with four sheep in them. Having just loaded the world, all of them, plus all but one cow from a nearby field, have vanished. I've previously had sheep loose for no reason, and various animals disappearing at any time.

It's not just me then. I had our fields, each with four sheep in them. Having just loaded the world, all of them, plus all but one cow from a nearby field, have vanished. I've previously had sheep loose for no reason, and various animals disappearing at any time.

Today the same. When I turned on my world a cow was walking around my house and it was magically escaped from the fence I placed for the cows.....

Today the same. When I turned on my world a cow was walking around my house and it was magically escaped from the fence I placed for the cows.....

This is a very severe and multi-faceted problem for me in Windows 10, making it near impossible to work with villagers or maintain sheep populations in multiple colours.
I have my villagers in my iron golem farm in two containers - one contains one villager, and judging by the fact that four golems can occupy the platforms simultaneously the other has been bred up to 40+ villagers. I suffered the multi-villager container 'bursting', scattering the villagers in either the outside or inside of the farm, a couple of times, and subsequently built an exceptionally secure pen around the whole site assuming the issue was solely of temporarily permeable walls, but today I found that every occupant of the multi-villager pen had simply disappeared - none were to be found in the pen, the golem collection chamber or the local area (which is in a Desert, so I can see for a long way around). This affects the lowest difficulty 'peaceful' mode, so zombies can't be the problem.
Sheep have been my other main problem - I eventually got fed up of them vanishing and created four layers of four pens in a square and found that half of the pens (the two nearest my base on every layer) are perfectly fine while the other half have very high disappearance rates, despite the fact that all 16 pens have 'outer' pens to catch any sheep that might escape. There has been no mixing of colours (despite shared walls on every layer) and no opaque blocks are present between the ground and ceiling to suffocate the sheep, so I can only conclude that at least in the case of the sheep they are actually disappearing rather than dying. This is in a Jungle ( with only Mesa and Desert nearby) so wolves cannot be to blame.
Cows, pigs, rabbits and chickens have also been affected but they're much easier to cope with simply by occasionally bringing the population back up to a few breeding pairs. My horses are the only animals I keep in individual stables and seem entirely unaffected (alongside the villager kept alone in the golem farm).
In short it seems like in my game both escaping through walls and flat-out disappearance are major issues, exacerbated by high 'pen' occupancy, frequent unloading and loading of the affected chunks and/or nether travel. It also seems like loading the area from underground has triggered the major villager escapes and disappearances though I can't confirm this.

This is a very severe and multi-faceted problem for me in Windows 10, making it near impossible to work with villagers or maintain sheep populations in multiple colours.
I have my villagers in my iron golem farm in two containers - one contains one villager, and judging by the fact that four golems can occupy the platforms simultaneously the other has been bred up to 40+ villagers. I suffered the multi-villager container 'bursting', scattering the villagers in either the outside or inside of the farm, a couple of times, and subsequently built an exceptionally secure pen around the whole site assuming the issue was solely of temporarily permeable walls, but today I found that every occupant of the multi-villager pen had simply disappeared - none were to be found in the pen, the golem collection chamber or the local area (which is in a Desert, so I can see for a long way around). This affects the lowest difficulty 'peaceful' mode, so zombies can't be the problem.
Sheep have been my other main problem - I eventually got fed up of them vanishing and created four layers of four pens in a square and found that half of the pens (the two nearest my base on every layer) are perfectly fine while the other half have very high disappearance rates, despite the fact that all 16 pens have 'outer' pens to catch any sheep that might escape. There has been no mixing of colours (despite shared walls on every layer) and no opaque blocks are present between the ground and ceiling to suffocate the sheep, so I can only conclude that at least in the case of the sheep they are actually disappearing rather than dying. This is in a Jungle ( with only Mesa and Desert nearby) so wolves cannot be to blame.
Cows, pigs, rabbits and chickens have also been affected but they're much easier to cope with simply by occasionally bringing the population back up to a few breeding pairs. My horses are the only animals I keep in individual stables and seem entirely unaffected (alongside the villager kept alone in the golem farm).
In short it seems like in my game both escaping through walls and flat-out disappearance are major issues, exacerbated by high 'pen' occupancy, frequent unloading and loading of the affected chunks and/or nether travel. It also seems like loading the area from underground has triggered the major villager escapes and disappearances though I can't confirm this.

Can confirm this bug happens on mcpe version 0.15.2 on iPhone 6s. Happens to my donkeys and mules who have saddles and filled chests on them, squids, both iron and snow golems, livestock such as pigs, cows, sheep, rabbits, mooshrooms, horses both tame and wild, chickens, and probably some other stuff.
It doesn't matter if they're tied to something, named, have stuff in their inventory/on them like saddles, in pens, they STILL despawn! This bug is ruining my animal farms and now they're pretty much empty. You should make it so that animals in fences, named or not, or tied up will not ever despawn, like they're recognized as "domesticated" by the game.
It's happened so many times in my creative world, I'm getting fed up by having to re-tame and reequip stuff to my horses and donkeys and respawn animals in my farms. Please either fix this issue sometime soon or bring an update to minecraft in general to not despawn animals etc. when tied up or enclosed by fences!

Can confirm this bug happens on mcpe version 0.15.2 on iPhone 6s. Happens to my donkeys and mules who have saddles and filled chests on them, squids, both iron and snow golems, livestock such as pigs, cows, sheep, rabbits, mooshrooms, horses both tame and wild, chickens, and probably some other stuff.
It doesn't matter if they're tied to something, named, have stuff in their inventory/on them like saddles, in pens, they STILL despawn! This bug is ruining my animal farms and now they're pretty much empty. You should make it so that animals in fences, named or not, or tied up will not ever despawn, like they're recognized as "domesticated" by the game.
It's happened so many times in my creative world, I'm getting fed up by having to re-tame and reequip stuff to my horses and donkeys and respawn animals in my farms. Please either fix this issue sometime soon or bring an update to minecraft in general to not despawn animals etc. when tied up or enclosed by fences!

Affects 0.15.3, plz fix this bug

Affects 0.15.3, plz fix this bug

I accidentally created a test in my survival map that may contain valuable constraints for resolving this.
Background
===
I have built a farm that has four sections, containing rabbits, sheep, pigs and cows in the form of a ç”° shape. Seriously coincidentally, the middle partition that separated pigs and cows from sheep and rabbits is located at the east-west axis (not sure if it is X or Z) (The sun comes out from the north).
TL;DR: I made sure that all pigs and cows are at the northwest of the spawnpoint (assuming the sun comes out from the north), and all sheep and rabbits are at the southwest of the spawnpoint. Neither chunk are adjacent to the spawnpoint (approximately 20+ blocks to the west from spawnpoint).
Only the pigs and cows (northwest) despawned.
A point to note is that the bug is most likely not caused by having too many entities in that chunk, because about 20 blocks to the south of the west axis (yes, in the sea, as you can see from the image I link below), I have a large chicken farm that has probably as many chickens as the sum of the four animal types in the farm I mentioned above.
Therefore, I conclude that this bug (at least, this instance that I encountered) only occurs at the northwest (not sure about the east) of the spawn.
Reproducing
===
The seed for the map is 1421809520 (infinity seed). My farm is on the sand island in the right-bottom corner you see in this image: http://epicminecraftpeseeds.com/wp-content/uploads/2015/07/mcpe-0_11-fishing-village.jpeg
The camera is at the north side looking at the south side.
I have only encountered all cows and pigs despawning (I actually can't confirm if they despawned or died, because I don't always check the farm) when I sail far away (not sure how far) and come back. It seems that every time I make a long journey away from the spawn through boat (I mentioned boat so that you can see that I am moving a long way properly, then back properly, to the extent of at least 128 blocks), these mobs despawn. I am unable to prove if the direction of travelling affects.
It also appears that travelling to the nether, and even nether express travelling (coming back to the overworld at a portal very far away) does not cause this issue to occur.
Version
===
The above were all tested when I was using 0.15.3. Since I updated to 0.15.4 I have not played a lot on this world yet, so I am unable to show if this is still present. (You should know it if you fixed it!)

I accidentally created a test in my survival map that may contain valuable constraints for resolving this.
Background
===
I have built a farm that has four sections, containing rabbits, sheep, pigs and cows in the form of a ç”° shape. Seriously coincidentally, the middle partition that separated pigs and cows from sheep and rabbits is located at the east-west axis (not sure if it is X or Z) (The sun comes out from the north).
TL;DR: I made sure that all pigs and cows are at the northwest of the spawnpoint (assuming the sun comes out from the north), and all sheep and rabbits are at the southwest of the spawnpoint. Neither chunk are adjacent to the spawnpoint (approximately 20+ blocks to the west from spawnpoint).
Only the pigs and cows (northwest) despawned.
A point to note is that the bug is most likely not caused by having too many entities in that chunk, because about 20 blocks to the south of the west axis (yes, in the sea, as you can see from the image I link below), I have a large chicken farm that has probably as many chickens as the sum of the four animal types in the farm I mentioned above.
Therefore, I conclude that this bug (at least, this instance that I encountered) only occurs at the northwest (not sure about the east) of the spawn.
Reproducing
===
The seed for the map is 1421809520 (infinity seed). My farm is on the sand island in the right-bottom corner you see in this image: http://epicminecraftpeseeds.com/wp-content/uploads/2015/07/mcpe-0_11-fishing-village.jpeg
The camera is at the north side looking at the south side.
I have only encountered all cows and pigs despawning (I actually can't confirm if they despawned or died, because I don't always check the farm) when I sail far away (not sure how far) and come back. It seems that every time I make a long journey away from the spawn through boat (I mentioned boat so that you can see that I am moving a long way properly, then back properly, to the extent of at least 128 blocks), these mobs despawn. I am unable to prove if the direction of travelling affects.
It also appears that travelling to the nether, and even nether express travelling (coming back to the overworld at a portal very far away) does not cause this issue to occur.
Version
===
The above were all tested when I was using 0.15.3. Since I updated to 0.15.4 I have not played a lot on this world yet, so I am unable to show if this is still present. (You should know it if you fixed it!)

^ Someone should test this. ^

^ Someone should test this. ^

Still Happening in 0.15.4.
Cows seem to despawn after using a lead on them.

Still Happening in 0.15.4.
Cows seem to despawn after using a lead on them.

Edit to my own comment: It appears nether portal travelling *sometimes* causes the despawn as well.

Edit to my own comment: It appears nether portal travelling *sometimes* causes the despawn as well.

Mobs do despawn in Realm 0.15.6. My named Tsar II horse with armor gone 😞

Mobs do despawn in Realm 0.15.6. My named Tsar II horse with armor gone 😞

Still Happens on 0.15.7. iPod Touch 6th Gen

Still Happens on 0.15.7. iPod Touch 6th Gen

This bug makes it very hard to keep farms going, I just had an entire Iron Farm worth of villagers disappear (around 30 villagers) within a day. Cows and chickens keep disappearing. If I wasn't constantly breading them all my NPC's would be gone within a week. Keeping them in mine carts does not work, Naming them does not work. they still despawn taking the minecart or any other item attached with them. I spend more time maintaining my farms then building, it's making a time consuming game. Some farms I haven't built, Such as a sheep farm, because I just can't maintain them with the despawns that are occurring.
If you want a good way to test it, Build a chicken farm that is self maintaining and have other npc's around. Once there are a bunch of chickens, the other NPS's will disappear unless you have done something with them recently. I can't guarantee this is always the case but I have noticed that when one of my farms has a lot of Npc's the others end up short of livestock
Affected version 0.15.7, Realms

From my observations it feels like they despawn every time realm crashes.
Or realm crashes because they despawn

From my observations it feels like they despawn every time realm crashes.
Or realm crashes because they despawn

Further to my earlier comment, I've put a massive lightning-proofing shield on my iron farm (looks like PE can get lightning in deserts?), and brought the number of villager pods up to 4, and I still find that nearly every time I visit it one of the pods has spontaneously emptied (usually just vanished but occasionally exploded all around the farm or into the golem collection chamber). I'm nearly at the point of trying ten individual pods.
I've gathered a dozen or so villagers elsewhere in individual cells (way too excited for trading to eventually be released) and they don't seem to be affected but they're also likely less often loaded and unloaded.
My sheep still vanish, with half of the pens starting to empty and the other half not... but it's not consistent which half is affected >_<

Further to my earlier comment, I've put a massive lightning-proofing shield on my iron farm (looks like PE can get lightning in deserts?), and brought the number of villager pods up to 4, and I still find that nearly every time I visit it one of the pods has spontaneously emptied (usually just vanished but occasionally exploded all around the farm or into the golem collection chamber). I'm nearly at the point of trying ten individual pods.
I've gathered a dozen or so villagers elsewhere in individual cells (way too excited for trading to eventually be released) and they don't seem to be affected but they're also likely less often loaded and unloaded.
My sheep still vanish, with half of the pens starting to empty and the other half not... but it's not consistent which half is affected >_<

They need to remove fix version 0.14.0 because the bug wasn't fixed in that version.

They need to remove fix version 0.14.0 because the bug wasn't fixed in that version.
The issue has already been reopened, don't worry.
The issue has already been reopened, don't worry.

Jeez will they ever fix this one? lol

Jeez will they ever fix this one? lol

Still happens on 0.15.9 and 0.16.0 Beta 4
All passive, hostile, and block entities still despawn. Though, if a lead is attached to a mob, it signifigantly decreases the change of despawn, but will despawn after a while.

Still happens on 0.15.9 and 0.16.0 Beta 4
All passive, hostile, and block entities still despawn. Though, if a lead is attached to a mob, it signifigantly decreases the change of despawn, but will despawn after a while.

Affects Version(s): 0.15.10 and 0.15.90.8 much more than previous updates.
All entities still despawn. Though, if mob attached to lead has a lower despawn chance, but will still despawn. Another problem is that sometimes painting and signs will fall off.
Villagers:
Most of the time, whenever I find villages, it appears that villagers either failed to spawn or they must have despawned. Also villagers seem to have a higher despawn rate when more closer together
Passive mobs:
Passive mobs despawn over periods of time (they despawn after 2-10 days after spawning). Animals still despawn even though both leads and nametags are present. Another thing I've realized is that the more animals are closer together, the much more of a chance they despawn. The farther they are apart, the longer they stay. Tamed animals also manage to disappear. From what I saw, they either noclip into blocks and suffocate or they despawn.
Hostile mobs:
Hostile mobs appear take longer to despawn than passive mobs. I can tell that isn't right. Hostile mobs seem to don't despawn as fast when the player is nearby.
Block entities (signs, torches, paintings, etc)
Block entities despawn "slower" than passive mobs. Torches, paintings, and signs will randomly fall off. Before 0.15.0, they seem to despawn when the player was away from the item for short to long peroids of time. After 0.15.0, it doesn't happen as often only now only happens to torches, paintings, and signs. Another thing I've noticed is that block entities have a more of a chance of despawning when the item is placed on cobblestone and/or oak planks.
There isn't much information that I cannot give to help or fully present the issue. This issue nearly makes animals farming impossible in survival without using leads and/or nametags to decrease the chances of despawning.
Affects Device(s):
iPod Touch 6th Generaton - iOS 10.0 Beta 4 - MCPE 0.15.10
iPad mini 3rd Generation - iOS 10.0.2 - MCPE 0.15.10
LG K7 - Android 5.1.1 - MCPE 0.15.90.8
Tracphone (unknown model) - Android 4.4.0 - MCPE 0.15.90.8
Desktop (Windows 10 Edition) - Windows 10 - MCPE 0.15.10

Affects Version(s): 0.15.10 and 0.15.90.8 much more than previous updates.
All entities still despawn. Though, if mob attached to lead has a lower despawn chance, but will still despawn. Another problem is that sometimes painting and signs will fall off.
Villagers:
Most of the time, whenever I find villages, it appears that villagers either failed to spawn or they must have despawned. Also villagers seem to have a higher despawn rate when more closer together
Passive mobs:
Passive mobs despawn over periods of time (they despawn after 2-10 days after spawning). Animals still despawn even though both leads and nametags are present. Another thing I've realized is that the more animals are closer together, the much more of a chance they despawn. The farther they are apart, the longer they stay. Tamed animals also manage to disappear. From what I saw, they either noclip into blocks and suffocate or they despawn.
Hostile mobs:
Hostile mobs appear take longer to despawn than passive mobs. I can tell that isn't right. Hostile mobs seem to don't despawn as fast when the player is nearby.
Block entities (signs, torches, paintings, etc)
Block entities despawn "slower" than passive mobs. Torches, paintings, and signs will randomly fall off. Before 0.15.0, they seem to despawn when the player was away from the item for short to long peroids of time. After 0.15.0, it doesn't happen as often only now only happens to torches, paintings, and signs. Another thing I've noticed is that block entities have a more of a chance of despawning when the item is placed on cobblestone and/or oak planks.
There isn't much information that I cannot give to help or fully present the issue. This issue nearly makes animals farming impossible in survival without using leads and/or nametags to decrease the chances of despawning.
Affects Device(s):
iPod Touch 6th Generaton - iOS 10.0 Beta 4 - MCPE 0.15.10
iPad mini 3rd Generation - iOS 10.0.2 - MCPE 0.15.10
LG K7 - Android 5.1.1 - MCPE 0.15.90.8
Tracphone (unknown model) - Android 4.4.0 - MCPE 0.15.90.8
Desktop (Windows 10 Edition) - Windows 10 - MCPE 0.15.10

Mobs dissapear after that mobs (passive,hostile not include) is behind me (out my camera vision).

Mobs dissapear after that mobs (passive,hostile not include) is behind me (out my camera vision).

Affects 0.16.0.5 and 0.15.10 much worse.

Affects 0.16.0.5 and 0.15.10 much worse.

Affects 0.16.1

Affects 0.16.1

Still happening to me in v0.16.2. Even named villagers seem to despawn. Most recently I had Wayne and Garth in a small fenced village inside of a walled courtyard that was also fenced. I was working a short distance away within the same loaded chunk and when I returned there was no trace of them 😞
Party on Wayne. Party on Garth.
1st Gen iPad Mini
iOS 9.3.5
Minecraft PE v0.16.2
Survival Mode

Still happening to me in v0.16.2. Even named villagers seem to despawn. Most recently I had Wayne and Garth in a small fenced village inside of a walled courtyard that was also fenced. I was working a short distance away within the same loaded chunk and when I returned there was no trace of them 😞
Party on Wayne. Party on Garth.
1st Gen iPad Mini
iOS 9.3.5
Minecraft PE v0.16.2
Survival Mode

Why hasn't this been fixed yet? It is a major issue and it has existed for almost two years.

Why hasn't this been fixed yet? It is a major issue and it has existed for almost two years.

I'm a noob to Minecraft - and only started playing a few weeks ago on Windown 10 Beta edition and have already lost almost all the villagers in two villages (the only two in my seed) to despawning. I've lost almost all of my animals, some horses with saddles, many dyed sheep. They just seem to disappear! I realise from reading this lengthy thread of comments that the issue has been ongoing for almost 2 years on pocket editions. May I suggest that when you do find a fix that you include a respawn for villagers for all of us who will have no villagers left by then - and who don't use commands? I've only ever played in survival on peaceful level. I'm so fed up with my game graft being wasted due to this issue, that I'm considering a) buying the full game instead or b) giving up Minecraft altogether - it's really disheartening to see quality game graft wasted. Please fix this - it's clearly bothering a lot of people.

I'm a noob to Minecraft - and only started playing a few weeks ago on Windown 10 Beta edition and have already lost almost all the villagers in two villages (the only two in my seed) to despawning. I've lost almost all of my animals, some horses with saddles, many dyed sheep. They just seem to disappear! I realise from reading this lengthy thread of comments that the issue has been ongoing for almost 2 years on pocket editions. May I suggest that when you do find a fix that you include a respawn for villagers for all of us who will have no villagers left by then - and who don't use commands? I've only ever played in survival on peaceful level. I'm so fed up with my game graft being wasted due to this issue, that I'm considering a) buying the full game instead or b) giving up Minecraft altogether - it's really disheartening to see quality game graft wasted. Please fix this - it's clearly bothering a lot of people.

Can someone please reopen this problem? This seems to still affect v0.16.1, v0.16.2, and the 1.0 Beta builds. It's shocking that this problem still has been happening for over 2 years and it still isn't fixed. The problem has gotten more worse since 0.15.0.

Can someone please reopen this problem? This seems to still affect v0.16.1, v0.16.2, and the 1.0 Beta builds. It's shocking that this problem still has been happening for over 2 years and it still isn't fixed. The problem has gotten more worse since 0.15.0.

I do not care mobs despawn randomly.This can be solutions for device reduce RAM usage.On my device,this can be happen if not sufficient of RAM.Not only Minecraft has same issue,other games like that,want to optimize RAM usage on device.
The point start I played mcpe since beta 0.8,mobs like cow dissapear.Sorry if I offtopic.

I do not care mobs despawn randomly.This can be solutions for device reduce RAM usage.On my device,this can be happen if not sufficient of RAM.Not only Minecraft has same issue,other games like that,want to optimize RAM usage on device.
The point start I played mcpe since beta 0.8,mobs like cow dissapear.Sorry if I offtopic.

This is getting a bit irritating. Farming animals is nearly impossible due to this bug.
Affects EVERY single version from 0.9.0 to present day.

This is getting a bit irritating. Farming animals is nearly impossible due to this bug.
Affects EVERY single version from 0.9.0 to present day.

miner error: Affects Version/s: last one should be 1.0.0. not 1.0.0.2 unless there was a new version also affects Device: windows 10 C++ or pc not sure whats it's under as well.

miner error: Affects Version/s: last one should be 1.0.0. not 1.0.0.2 unless there was a new version also affects Device: windows 10 C++ or pc not sure whats it's under as well.

Status update: Since I updated to 1.0 none of my animals despawned. Even if I were many chunks away (150-200) nothing happened and my complete farm were intact.

Status update: Since I updated to 1.0 none of my animals despawned. Even if I were many chunks away (150-200) nothing happened and my complete farm were intact.

Update: Win 10 edition, 1.0.0, still have this issue.

Update: Win 10 edition, 1.0.0, still have this issue.

In 1.0.0 mobs and block entities still despawn, but mobs connected to lead will not despawn anymore. Block entity don't despawn as fast as previous updates but still despawn.
Devices tested:
Apple iPad Mini 3 - iOS 10.1
LG K7 - Android Lolipop 5.1.1
Alcatel Onetouch Pixie Glitz - Android Kitkat 4.4
Huawei Honor 8 - Android Marshmallow 6.0

In 1.0.0 mobs and block entities still despawn, but mobs connected to lead will not despawn anymore. Block entity don't despawn as fast as previous updates but still despawn.
Devices tested:
Apple iPad Mini 3 - iOS 10.1
LG K7 - Android Lolipop 5.1.1
Alcatel Onetouch Pixie Glitz - Android Kitkat 4.4
Huawei Honor 8 - Android Marshmallow 6.0

I play on a realm using Windows 10 edition, and my nephews and their friends use the PE version on their phones and tablets. I can farm all during the week (when they are not allowed to have their electronics due to school week) and nothing despawns. As soon as Friday night comes along, any time one of them goes near my livestock (Sheep, Cows, Pigs, and Chickens) and then logout of the realm, the livestock despawns. If just one of them is on and then logs off, I generally get left with 4 of each livestock type, which I can use to re-breed the numbers back up. But if more than one of them logs in, comes near the livestock and logs out, I am left with nothing. Its like their version of the client can't keep track of as many animals, so when they save anything they weren't tracking gets deleted by their save.

I play on a realm using Windows 10 edition, and my nephews and their friends use the PE version on their phones and tablets. I can farm all during the week (when they are not allowed to have their electronics due to school week) and nothing despawns. As soon as Friday night comes along, any time one of them goes near my livestock (Sheep, Cows, Pigs, and Chickens) and then logout of the realm, the livestock despawns. If just one of them is on and then logs off, I generally get left with 4 of each livestock type, which I can use to re-breed the numbers back up. But if more than one of them logs in, comes near the livestock and logs out, I am left with nothing. Its like their version of the client can't keep track of as many animals, so when they save anything they weren't tracking gets deleted by their save.

realms in server side so it should have nothing to do with animals vanishing as well windows 10 and PE is the same version otherwise you won't be able to play together

realms in server side so it should have nothing to do with animals vanishing as well windows 10 and PE is the same version otherwise you won't be able to play together

Ok. After the update to 1.0.2 my cows disappeared. Other animals are not affected, as far as I can see (simply too many), but my cows disappeared completely. This time I never was far away, just played a long time some chunks away, where new animals spawned.
Any updates, when this will be fixed? It’s pretty annoying :\

Ok. After the update to 1.0.2 my cows disappeared. Other animals are not affected, as far as I can see (simply too many), but my cows disappeared completely. This time I never was far away, just played a long time some chunks away, where new animals spawned.
Any updates, when this will be fixed? It’s pretty annoying :\

This bug ALONE breaks all Survival experience: Villagers get empty, farms die out, and don't even mention how I lost hours getting a rare tint only to see the sheeps I tinted with it vanished on the immediately next load game.
Oh Mojang ... just put a flag of "tamed" on any mob we interact with (reproduce, tame, feed, tint, breed) and never despawn it.
The problem is probably related to how MCPE deals with all types of mobs spawning/despawning, while Java edition never despawned passive mobs. Either copy Java edition approach, or flag passive mobs as "permanent" once users interact with it.

This bug ALONE breaks all Survival experience: Villagers get empty, farms die out, and don't even mention how I lost hours getting a rare tint only to see the sheeps I tinted with it vanished on the immediately next load game.
Oh Mojang ... just put a flag of "tamed" on any mob we interact with (reproduce, tame, feed, tint, breed) and never despawn it.
The problem is probably related to how MCPE deals with all types of mobs spawning/despawning, while Java edition never despawned passive mobs. Either copy Java edition approach, or flag passive mobs as "permanent" once users interact with it.
Affecting 1.0.3.0.
Affecting 1.0.3.0.

I'm having the same issue on Windows 10 Edition version 1.0.2. Passive mobs including horses, cows, sheep, pigs, chickens and rabbits have been disappearing from my fenced pens. The pens are dug one block under ground level with a one block high fence (some are two blocks high). The pens also include a 2x2x1 pond of water. The animals tend to gather in one far corner with two or more occupying one block. The animals are either escaping, dying by suffocating in the dirt or fence, or despawning. This has happened multiple times with multiple animals in multiple fenced pens over and over again. I will go underground to mine and when I come back up all my horses or rabbits will be gone and the pen will be empty. Extremely frustrating especially for rarer animals I have to travel far to find. Also noticing villages once populated are now empty.
Mojang, please fix this issue. Or at least allow us to switch back and forth between survival and creative to repopulate farms/villages in Windows 10 without the penalty of permanently disabling achievements. I agree with previous comments that this one issue alone makes the game practically unplayable as it randomly undoes all the work I put into my favorite part of the game.

I'm having the same issue on Windows 10 Edition version 1.0.2. Passive mobs including horses, cows, sheep, pigs, chickens and rabbits have been disappearing from my fenced pens. The pens are dug one block under ground level with a one block high fence (some are two blocks high). The pens also include a 2x2x1 pond of water. The animals tend to gather in one far corner with two or more occupying one block. The animals are either escaping, dying by suffocating in the dirt or fence, or despawning. This has happened multiple times with multiple animals in multiple fenced pens over and over again. I will go underground to mine and when I come back up all my horses or rabbits will be gone and the pen will be empty. Extremely frustrating especially for rarer animals I have to travel far to find. Also noticing villages once populated are now empty.
Mojang, please fix this issue. Or at least allow us to switch back and forth between survival and creative to repopulate farms/villages in Windows 10 without the penalty of permanently disabling achievements. I agree with previous comments that this one issue alone makes the game practically unplayable as it randomly undoes all the work I put into my favorite part of the game.

Confirming this is a continuing issue in 1.0.3 of the Win 10 Edition. I have experienced entire village's population vanishing during a day's exploration & mapping. Just today, my herd of nine tamed horses was reduced to only three – I had been out mapping for a number of game days – and all six that vanished had armor, including both gold & diamond sets. One of the vanished horses had been given a Nametag and was of the very fastest variety. This is a tremendous loss in terms of the amount of time put into cultivating the herd (using golden carrots to breed and taming in the wild) as well as rare armor (required pillaging 8 desert temples). I think this demands a refund for the game, which should not be out of Beta with a bug this egregious.
Addendum: A few hours of gameplay after making this report I lost yet another horse, this time with gold armor. I had checked the (reduced) herd earlier just before making the above report. I did not travel in the meanwhile, but worked around the area where the herd grazes. There were 3 or 4 rest cycles during this time. I searched the grounds and the surrounding terrain thoroughly but found no trace of either horse or armor. I have since removed the armor from my remaining two horses.
Second addendum: I bred my last two horses but the foal vanished after less than a real-time hour of gameplay. It is not possible that the foal escaped the grounds of my ranch as it has a 2-block high obsidian fence surrounding it that uses only button-activated metal doors as gates, and only one of these is two doors wide (horses cannot pass single-block gaps). There are no places where a horse might jump the perimeter fence either. There are no hazards inside the perimeter (such as ponds where the foal might drown) and no monsters can get through the perimeter – it has survived a couple of creeper blasts, and no recent damage is seen anywhere. Only an occasional spider wanders in and they do not pester the horses or cattle.
My ranch is relatively small in passive mob pop – 10 wolves (most in "sit" status), 8 cows, 12 sheep and about 15 chickens. However because of my exploration and mapping, the world file size is now 263 Mb, which may or may not be considered large, I have nothing to compare to.
It seems the game is for some reason limiting the number of horses I can have tamed. I have seen quite a few "wild" horses in the area, however, so total horse mob pop doesn't seem to matter.

Confirming this is a continuing issue in 1.0.3 of the Win 10 Edition. I have experienced entire village's population vanishing during a day's exploration & mapping. Just today, my herd of nine tamed horses was reduced to only three – I had been out mapping for a number of game days – and all six that vanished had armor, including both gold & diamond sets. One of the vanished horses had been given a Nametag and was of the very fastest variety. This is a tremendous loss in terms of the amount of time put into cultivating the herd (using golden carrots to breed and taming in the wild) as well as rare armor (required pillaging 8 desert temples). I think this demands a refund for the game, which should not be out of Beta with a bug this egregious.
Addendum: A few hours of gameplay after making this report I lost yet another horse, this time with gold armor. I had checked the (reduced) herd earlier just before making the above report. I did not travel in the meanwhile, but worked around the area where the herd grazes. There were 3 or 4 rest cycles during this time. I searched the grounds and the surrounding terrain thoroughly but found no trace of either horse or armor. I have since removed the armor from my remaining two horses.
Second addendum: I bred my last two horses but the foal vanished after less than a real-time hour of gameplay. It is not possible that the foal escaped the grounds of my ranch as it has a 2-block high obsidian fence surrounding it that uses only button-activated metal doors as gates, and only one of these is two doors wide (horses cannot pass single-block gaps). There are no places where a horse might jump the perimeter fence either. There are no hazards inside the perimeter (such as ponds where the foal might drown) and no monsters can get through the perimeter – it has survived a couple of creeper blasts, and no recent damage is seen anywhere. Only an occasional spider wanders in and they do not pester the horses or cattle.
My ranch is relatively small in passive mob pop – 10 wolves (most in "sit" status), 8 cows, 12 sheep and about 15 chickens. However because of my exploration and mapping, the world file size is now 263 Mb, which may or may not be considered large, I have nothing to compare to.
It seems the game is for some reason limiting the number of horses I can have tamed. I have seen quite a few "wild" horses in the area, however, so total horse mob pop doesn't seem to matter.

I gave up on this bug since they aren't likely going to fix it. This should REALLY be their focus but its not likely going to happen.

I gave up on this bug since they aren't likely going to fix it. This should REALLY be their focus but its not likely going to happen.

Adam, I actually am really hopefully about this bug getting priority soon, because they CANNOT release villager traders while this bug exists, because villagers vanishing with good trades, specially after you level their trades, would make the whole community come with stone and axe after Mojang. So I think this bug will get fixed before or at the same time villager trades are released, and I feel that is close.
Meanwhile, I agree a bug that is 2 years "open" is unforgivable, specially because it makes you NEED to leave "enable cheats" on to play on survival since your animals keep vanishing and you need to respawn them manually

Adam, I actually am really hopefully about this bug getting priority soon, because they CANNOT release villager traders while this bug exists, because villagers vanishing with good trades, specially after you level their trades, would make the whole community come with stone and axe after Mojang. So I think this bug will get fixed before or at the same time villager trades are released, and I feel that is close.
Meanwhile, I agree a bug that is 2 years "open" is unforgivable, specially because it makes you NEED to leave "enable cheats" on to play on survival since your animals keep vanishing and you need to respawn them manually

Well, with animals res pawing on their own in the wild, and villagers can be built, one doesn't have to go into cheat mode to fix the issue. We all live with this. I don't leave saddles and armor on my horses anymore, I keep a chest at my corral.
Granted, I wish this didn't happen. I hate keeping my villagers locked in a small room to keep them breeding.
Here's to hoping they resolve this soon.

Well, with animals res pawing on their own in the wild, and villagers can be built, one doesn't have to go into cheat mode to fix the issue. We all live with this. I don't leave saddles and armor on my horses anymore, I keep a chest at my corral.
Granted, I wish this didn't happen. I hate keeping my villagers locked in a small room to keep them breeding.
Here's to hoping they resolve this soon.

I wish that putting animals in small rooms fixed the problem always, but the animals still disappear in small rooms.

I wish that putting animals in small rooms fixed the problem always, but the animals still disappear in small rooms.
How bad is it in 1.0.4.0?
How bad is it in 1.0.4.0?

On our realms server, this bug has gotten significantly worse in 1.0.3 from what I can tell. Our farms constantly depopulate when we travel to and from the nether. Any progress on it in 1.0.4?

On our realms server, this bug has gotten significantly worse in 1.0.3 from what I can tell. Our farms constantly depopulate when we travel to and from the nether. Any progress on it in 1.0.4?

Experience this in 1.0.3 on a realm. I use a nexus 10. Seems to happen when I travel away from my farm and the chunk unloads. Doesn't happen on save and reload. Happen on both peaceful and easy. But the biggest loss was on Easy.

Experience this in 1.0.3 on a realm. I use a nexus 10. Seems to happen when I travel away from my farm and the chunk unloads. Doesn't happen on save and reload. Happen on both peaceful and easy. But the biggest loss was on Easy.
Any changes for this in 1.0.4.1?
Any changes for this in 1.0.4.1?

Ok something I observed in the past 2 MONTH, currently at 1.0.3 (Win10):
I was almost confident that once "really" marked not to despawn, cows/sheeps/etc would stay because my both my main farm and my secondary farm (distant ones) didn't experience any loss for nearly a month.
Well, today half of my oldest farm vanished.
So I am 100% sure it is load/save related. Also, the "vanishings" NEVER happen while playing (moving around, moving to/from nether etc), ONLY after a LOAD
Maybe something on the save file compress that doesn't happen every time?

Ok something I observed in the past 2 MONTH, currently at 1.0.3 (Win10):
I was almost confident that once "really" marked not to despawn, cows/sheeps/etc would stay because my both my main farm and my secondary farm (distant ones) didn't experience any loss for nearly a month.
Well, today half of my oldest farm vanished.
So I am 100% sure it is load/save related. Also, the "vanishings" NEVER happen while playing (moving around, moving to/from nether etc), ONLY after a LOAD
Maybe something on the save file compress that doesn't happen every time?

Im pretty sure its not Save file related, just witnessed pig despawn, realm server.
Came here to report this. Probably performance depended, cause prior despawn my realm lagged a bit.

Im pretty sure its not Save file related, just witnessed pig despawn, realm server.
Came here to report this. Probably performance depended, cause prior despawn my realm lagged a bit.

I haven't been experiencing the issue for a while (1.0.3) but I'd like to share some info that might be helpful.
When the bug happens, most, if not all, entities only in a specific subchunk despawn.
I have a chicken farm and two separate cow farms (CowA and CowB). The chicken farm and CowA are in the same chunk, and CowB is in an adjacent chunk. As far as I can observe, the bug only affects one of the two chunks separately. That is, when the chickens despawn, cows in CowA also despawn but those in CowB are almost always intact. Likewise, when the cows in CowB despawn, cows in CowA and chickens are also intact.
I have also several stacked cages of villagers. One cage is at the ground level (VillA), and another is in the air (VillB) 64 blocks above VillA. These two cages are in the same chunk (yes they are part of my iron farm) but are obviously in two distinct subchunks. When villagers in VillA despawn, VillB is usually unaffected. And when those in VillB despawn, VillA is also usually intact.
Chunks with large number of entities have a higher chance of triggering the bug.
I also noticed that the more entities I have in a chunk, the higher probability they despawn. When a chunk has only a few entities, they are almost never be affected by the bug. But when the chunk has many entities, say 20 cows, they are highly prone to despawn. And interestingly enough, when a chunk with many entities triggers the bug and a few of them manage to survive, those a few survivors are less likely to despawn until I bring the population back.
The bug only happens on a chunk load/unload.
You can only trigger the bug by moving far away, reloading the world, or moving through dimensions. The bug never happens when a chunk is up and running, say keeping the game running afk overnight.

I haven't been experiencing the issue for a while (1.0.3) but I'd like to share some info that might be helpful.
When the bug happens, most, if not all, entities only in a specific subchunk despawn.
I have a chicken farm and two separate cow farms (CowA and CowB). The chicken farm and CowA are in the same chunk, and CowB is in an adjacent chunk. As far as I can observe, the bug only affects one of the two chunks separately. That is, when the chickens despawn, cows in CowA also despawn but those in CowB are almost always intact. Likewise, when the cows in CowB despawn, cows in CowA and chickens are also intact.
I have also several stacked cages of villagers. One cage is at the ground level (VillA), and another is in the air (VillB) 64 blocks above VillA. These two cages are in the same chunk (yes they are part of my iron farm) but are obviously in two distinct subchunks. When villagers in VillA despawn, VillB is usually unaffected. And when those in VillB despawn, VillA is also usually intact.
Chunks with large number of entities have a higher chance of triggering the bug.
I also noticed that the more entities I have in a chunk, the higher probability they despawn. When a chunk has only a few entities, they are almost never be affected by the bug. But when the chunk has many entities, say 20 cows, they are highly prone to despawn. And interestingly enough, when a chunk with many entities triggers the bug and a few of them manage to survive, those a few survivors are less likely to despawn until I bring the population back.
The bug only happens on a chunk load/unload.
You can only trigger the bug by moving far away, reloading the world, or moving through dimensions. The bug never happens when a chunk is up and running, say keeping the game running afk overnight.

@unknown, it should be noted that entities despawning is intended when the entity has never been interacted with before. Had that pig been interacted with prior to despawning, and if so, how?

@SuperGeniusZeb What constitutes "interacted with"? For example, I have a chicken farm on my realms server that always despawns its mobs when players travel to the nether. If no one remains behind in the chunk, all the animals will be gone when we come back.
In the case of chickens, they have been created as a result of a player throwing eggs, but otherwise hadn't been interacted with after that. Do we need to interact with them further for them to stick around? There are also cows that have been fed wheat and/or bred and those also despawn after the chunk unloads.
Note: nothing despawns as a result of logging out and back in, but when the chunk unloads due to teleporting to the nether.

@SuperGeniusZeb What constitutes "interacted with"? For example, I have a chicken farm on my realms server that always despawns its mobs when players travel to the nether. If no one remains behind in the chunk, all the animals will be gone when we come back.
In the case of chickens, they have been created as a result of a player throwing eggs, but otherwise hadn't been interacted with after that. Do we need to interact with them further for them to stick around? There are also cows that have been fed wheat and/or bred and those also despawn after the chunk unloads.
Note: nothing despawns as a result of logging out and back in, but when the chunk unloads due to teleporting to the nether.

@unknown, I honestly don't know. 😛 I've asked the devs about it... I'll update the ticket when I get a response. 🙂

Updated the ticket with an explanation of what counts as "interaction" with an entity. Also, good news! Apparently the devs have finally been able to find what they believe is the cause of the bug, and they're hoping to have it fixed when they release 1.0.5! 😃 (Yeah, not 1.0.4, unfortunately, because that version has already been "frozen" in development and is being prepared for full release. 😛)

Thanks SuperGeniusZeb!
> If the entity ever sets you as its target, follows you, gets fed/bred/punched/etc. by you, that counts as interaction.
So, does this mean that in the case of chickens if they are spawned as a result of a player throwing an egg but no further interaction takes place, they are supposed to despawn? Or does the spawning through player throwing an egg cause them to be "interracted with"?
Very happy it sounds like this might be resolved soon.

Thanks SuperGeniusZeb!
> If the entity ever sets you as its target, follows you, gets fed/bred/punched/etc. by you, that counts as interaction.
So, does this mean that in the case of chickens if they are spawned as a result of a player throwing an egg but no further interaction takes place, they are supposed to despawn? Or does the spawning through player throwing an egg cause them to be "interracted with"?
Very happy it sounds like this might be resolved soon.

A problem that I see is that you DONT interact with villagers as often, even with trades, early on. Say I start a new game near a village, I am not going to do trades with them until I have stuff.
Villagers should be always tagged as "do-not-despawn", after all, they don't spawn freely as other friendly mobs.

A problem that I see is that you DONT interact with villagers as often, even with trades, early on. Say I start a new game near a village, I am not going to do trades with them until I have stuff.
Villagers should be always tagged as "do-not-despawn", after all, they don't spawn freely as other friendly mobs.

Despawned animals are from my farm, so i did interact with them ie at least feed

Despawned animals are from my farm, so i did interact with them ie at least feed

@unknown, villagers are tagged to not despawn by default. However, this bug causes them to despawn during chunk-loading/unloading anyway.
@unknown, yes, the bug still exists in the latest beta, and will still exist in the release version of 1.0.4. The devs plan on having it fixed in 1.0.5, however.

@unknown, I'm not sure about the egg-thing. I'll ask. 🙂
EDIT: Yes, chickens from eggs and animals from breeding should both be persistent. 😃

Perfect thank you! Just gotta wait for 1.0.5. Hopefully soon!

Perfect thank you! Just gotta wait for 1.0.5. Hopefully soon!

The horses that vanished from my ranch (a total of 6) all had been fed apples & equipped with saddles & armor of varying types, including gold & diamond. A few had been bred with golden carrots. Therefore the "interaction" consideration is not relevant.

The horses that vanished from my ranch (a total of 6) all had been fed apples & equipped with saddles & armor of varying types, including gold & diamond. A few had been bred with golden carrots. Therefore the "interaction" consideration is not relevant.

@Chip Well, this bug has not been fixed yet so that is unfortunately the current behavior. The intended behavior is as SuperGeniusZeb described and should be the case after 1.0.5 comes out if all goes well. It's relevant in knowing what should function after the bug is fixed and what is actually a bug vs what is working as intended. In your case, the despawning is definitely due to the bug, which means it should not continue to occur after the next update.

@Chip Well, this bug has not been fixed yet so that is unfortunately the current behavior. The intended behavior is as SuperGeniusZeb described and should be the case after 1.0.5 comes out if all goes well. It's relevant in knowing what should function after the bug is fixed and what is actually a bug vs what is working as intended. In your case, the despawning is definitely due to the bug, which means it should not continue to occur after the next update.
Anyone who's playing 1.0.5.0, is this still happening?
Anyone who's playing 1.0.5.0, is this still happening?

No? Maybe? Because i used a command block (teleport @e ~ ~ ~) and it always adding not despawn

No? Maybe? Because i used a command block (teleport @e ~ ~ ~) and it always adding not despawn

@unknown, just a reminder that entities that have never been interacted with are supposed to despawn, and entities teleported to you may still not technically ever interact with you during this process, so they might still despawn randomly. And this bug only occurs during chunk load/unload, so the teleport test wouldn't really work anyway.
This has been 'fixed' according to the 1.0.5.0 changelog.
This has been 'fixed' according to the 1.0.5.0 changelog.

Since no one has been able to repro this bug in 1.0.5.0, and since it is supposed to be fixed in this version, I'm resolving this issue as fixed. 😃
If anyone can still repro this in 1.0.5.3, post in the comments here. Remember that entities that have never been interacted with are SUPPOSED to despawn. (Except entities like villagers, shulkers, elder guardians, etc., which are persistent by default.) When testing this bug, please make sure to interact with the entities you're observing first.
If the entity ever sets you as its target, follows you, gets fed/bred/punched/etc. by you, that counts as interaction.

This is not fixed. Please re-open.
I had it happen in 1.0.5. I was eagerly awaiting the update because of problems with this.
I went through the Nether to travel to a distant part of the overworld with another player in a realm, then came back. Upon returning to my base, all nearby peaceful mobs had despawned. This included sheep that I had bred, penned, and dyed with each available color, cows I had bred and penned, dogs that were parked, and a corralled, tame horse.
I'm not sure if it is the same bug, but I also had a cat despawn within a few seconds of my taming it.
If anything, the bug seems worse. I'd lost some chickens before, but in this case I lost every single domesticated animal in my base.

This is not fixed. Please re-open.
I had it happen in 1.0.5. I was eagerly awaiting the update because of problems with this.
I went through the Nether to travel to a distant part of the overworld with another player in a realm, then came back. Upon returning to my base, all nearby peaceful mobs had despawned. This included sheep that I had bred, penned, and dyed with each available color, cows I had bred and penned, dogs that were parked, and a corralled, tame horse.
I'm not sure if it is the same bug, but I also had a cat despawn within a few seconds of my taming it.
If anything, the bug seems worse. I'd lost some chickens before, but in this case I lost every single domesticated animal in my base.

I'm running windows 10 edition, and this is happening. Just lost entire herd of cows, sheep, horses, everything gone.

I'm running windows 10 edition, and this is happening. Just lost entire herd of cows, sheep, horses, everything gone.

Is this happening on mobs that spawned prior to the 1.0.5 update but are still around? On our realms server, we lost some chickens and horses on 1.0.5 that had spawned prior to the update. However, I don't believe it has happened yet to new mobs that spawned after 1.0.5.

Is this happening on mobs that spawned prior to the 1.0.5 update but are still around? On our realms server, we lost some chickens and horses on 1.0.5 that had spawned prior to the update. However, I don't believe it has happened yet to new mobs that spawned after 1.0.5.

I'm having this issue in vanilla Minecraft on my PC. I had a 3 powered rail line with 2 minecarts with a pig in each. I was using them to breed more to fill a larger farm of similar minecart design. I logged on one day to find both pigs and both minecarts vanished without a trace. I continued filling the farm using another pair of pigs. I log on one day and noticed 6 pairs of cows and minecarts had up and vanished.

I'm having this issue in vanilla Minecraft on my PC. I had a 3 powered rail line with 2 minecarts with a pig in each. I was using them to breed more to fill a larger farm of similar minecart design. I logged on one day to find both pigs and both minecarts vanished without a trace. I continued filling the farm using another pair of pigs. I log on one day and noticed 6 pairs of cows and minecarts had up and vanished.

After updating to 1.0.6 on our realms server, all chickens in our chicken farm have disappeared. They had all been spawned from player-thrown eggs on version 1.0.5.
I do not believe this issue is fixed.

After updating to 1.0.6 on our realms server, all chickens in our chicken farm have disappeared. They had all been spawned from player-thrown eggs on version 1.0.5.
I do not believe this issue is fixed.

@unknown Were the chickens the only ones to despawn? This could be separate bug with chickens-from-eggs not being set as persistent automatically.

That's a good question. I think that some of the chickens had been fed to accelerate their growth as well, but I am not completely sure that's true. I will definitely keep an eye on it more closely.

That's a good question. I think that some of the chickens had been fed to accelerate their growth as well, but I am not completely sure that's true. I will definitely keep an eye on it more closely.

My son and I have been playing multiplayer on AppleTV + an iPad, and ever since 1.0.5.0, we have been experiencing this bug. If both of us travel to the Nether and then both return, all of our farmed cows and chickens disappear. We have seen this happen on 1.0.6.0 as well. This has made it really hard to play the game because our sources of food and arrows are now both gone, and we cannot replenish them. By way of further explanation, the game is hosted on AppleTV, and I am the one joining from an iPad, and I think have been the one to interact with the animals (feeding, breeding, slaughtering). I am not, but I think my son has not interacted with them. Is this happening because he needs to interact with the animals since it is his game? By further way of explanation, this nether-despawning of our animals seemed to have started when I fell into lava in the nether and died over there (and respawned in the overworld), but now it happens every time we go to the nether.
Strangely, we are now seeing a lot of other supposedly-resolved bugs starting in 1.0.5.0. I see the same item show up in multiple slots in the hot bar, even though I don't have multiple stacks of it, and when I feed animals, there is a chance that what I am feeding them (wheat, seeds) gets duplicated into another inventory slot, replacing something more valuable. I lost a bed this way while exploring, and I lost a stack of cooked meat.
Is there a thing where these old bugs affect the latest MCPE now?

My son and I have been playing multiplayer on AppleTV + an iPad, and ever since 1.0.5.0, we have been experiencing this bug. If both of us travel to the Nether and then both return, all of our farmed cows and chickens disappear. We have seen this happen on 1.0.6.0 as well. This has made it really hard to play the game because our sources of food and arrows are now both gone, and we cannot replenish them. By way of further explanation, the game is hosted on AppleTV, and I am the one joining from an iPad, and I think have been the one to interact with the animals (feeding, breeding, slaughtering). I am not, but I think my son has not interacted with them. Is this happening because he needs to interact with the animals since it is his game? By further way of explanation, this nether-despawning of our animals seemed to have started when I fell into lava in the nether and died over there (and respawned in the overworld), but now it happens every time we go to the nether.
Strangely, we are now seeing a lot of other supposedly-resolved bugs starting in 1.0.5.0. I see the same item show up in multiple slots in the hot bar, even though I don't have multiple stacks of it, and when I feed animals, there is a chance that what I am feeding them (wheat, seeds) gets duplicated into another inventory slot, replacing something more valuable. I lost a bed this way while exploring, and I lost a stack of cooked meat.
Is there a thing where these old bugs affect the latest MCPE now?

Sadly this is still an issue, animals sometimes disappear when coming back from the nether as Richard mentioned.
They also disappear when one player is in the Nether and player two logs out of the overworld. When player two logs back in the Realm all animals in the loaded chunks will be gone. This happened to us in Realms on Win 10 edition.
How to reproduce:
Have your developer friend sit in the Nether while you are in the overworld with your animals (already interacted with). Now leave the Realm, wait a bit and log back in all they while your friend is still in the Nether. Now look around and wonder where your villagers and animals are.

Sadly this is still an issue, animals sometimes disappear when coming back from the nether as Richard mentioned.
They also disappear when one player is in the Nether and player two logs out of the overworld. When player two logs back in the Realm all animals in the loaded chunks will be gone. This happened to us in Realms on Win 10 edition.
How to reproduce:
Have your developer friend sit in the Nether while you are in the overworld with your animals (already interacted with). Now leave the Realm, wait a bit and log back in all they while your friend is still in the Nether. Now look around and wonder where your villagers and animals are.

This bug is still happening for me on Windows 10 version 1.0.7. I have lost horses (and other animals) inside pens multiple times. I have led them with wheat/carrots, tamed them, placed saddles on them and definitely "interacted" with them in many ways. I have tried naming them, attaching them with a lead to the inside of a closed fence two blocks high and I still lose them. As I mentioned in a previous comment a couple months ago, the animals tend to gather in one corner with two or more occupying the same space. The animals are either escaping, dying by suffocating in the dirt or fence, or despawning. This happens on new peaceful single player worlds with animals that have spawned since 1.0.5. This most recent time, I had six horses in a 9x9 fence and when I logged back on, all but two of them were gone. There was no lightning storm that could have killed them. Continuing to lose fast/special animals that take a long time to find is very frustrating. Please reopen this issue as it is clear from all the comments that it has not been successfully resolved for everyone.

This bug is still happening for me on Windows 10 version 1.0.7. I have lost horses (and other animals) inside pens multiple times. I have led them with wheat/carrots, tamed them, placed saddles on them and definitely "interacted" with them in many ways. I have tried naming them, attaching them with a lead to the inside of a closed fence two blocks high and I still lose them. As I mentioned in a previous comment a couple months ago, the animals tend to gather in one corner with two or more occupying the same space. The animals are either escaping, dying by suffocating in the dirt or fence, or despawning. This happens on new peaceful single player worlds with animals that have spawned since 1.0.5. This most recent time, I had six horses in a 9x9 fence and when I logged back on, all but two of them were gone. There was no lightning storm that could have killed them. Continuing to lose fast/special animals that take a long time to find is very frustrating. Please reopen this issue as it is clear from all the comments that it has not been successfully resolved for everyone.

I can also confirm that this is still a bug on our realms server after further testing. We've lost chickens, horses, and donkeys that have all been interacted with or named after 1.0.5 and onwards. It does seem less common than it was before 1.0.5, but it still occurs periodically.
This ticket should be reopened.

I can also confirm that this is still a bug on our realms server after further testing. We've lost chickens, horses, and donkeys that have all been interacted with or named after 1.0.5 and onwards. It does seem less common than it was before 1.0.5, but it still occurs periodically.
This ticket should be reopened.

To @unknown, @unknown, @unknown, @unknown, @unknown, @unknown, & @unknown, as well as anyone else still experiencing mob despawn issues:
Having read the recent comments, and after having discussed it with the other moderators, it seems clear that the bug that people are experiencing is a separate one from MCPE-8002, and that this bug is caused by going to the Nether and/or using Realms. I'm currently trying to figure out if MCPE-21416 happened on Realms or LAN/XBL multiplayer. I suspect this is either a Realms bug or a multiplayer-in-general bug. MCPE-21416 will probably wind up being the ticket for this remaining mob-despawn bug.

As I said in my comment, this is happening on new peaceful single player worlds. Eagerly anticipating this bug fix, I started a new survival world when 1.0.5 came out. Also, it has nothing to do with the nether as I have not been there yet in my new game. I am focusing on my farms and building my house first. If my animals will stop vanishing, then I will progress further in the game and go to the nether, but for now I'm going to hold off on it. The bug seems the same as prior to 1.0.5 as I said in my comment with the animals gathering in one specific corner of the pen and multiple animals in the same space. Again, I'm not on a realm/multiplayer and I have not been to the nether. Please consider reopening this ticket as it seems the same exact issue has not been resolved for everyone.

As I said in my comment, this is happening on new peaceful single player worlds. Eagerly anticipating this bug fix, I started a new survival world when 1.0.5 came out. Also, it has nothing to do with the nether as I have not been there yet in my new game. I am focusing on my farms and building my house first. If my animals will stop vanishing, then I will progress further in the game and go to the nether, but for now I'm going to hold off on it. The bug seems the same as prior to 1.0.5 as I said in my comment with the animals gathering in one specific corner of the pen and multiple animals in the same space. Again, I'm not on a realm/multiplayer and I have not been to the nether. Please consider reopening this ticket as it seems the same exact issue has not been resolved for everyone.

I have also seen the same "clustering" behavior in my pens, but for me on a Realm, in the same world were animals then later disappeared.
I've also seen villagers going insane with an entire village trying to go into and out of the same house/door. Not sure if it's a related behavior.

I have also seen the same "clustering" behavior in my pens, but for me on a Realm, in the same world were animals then later disappeared.
I've also seen villagers going insane with an entire village trying to go into and out of the same house/door. Not sure if it's a related behavior.

MCPE-21416 is now the ticket for the Realms/Nether issue. If you have any information relating to entities despawning when traveling to the Nether in multiplayer, please report it there.
@unknown, due to the fact that you seem to be the only one so far to report having problems and NOT be using Realms and/or the Nether, and since you mention the entities clustering together near fences, I think your previous suggestion that they might be escaping the fence is probably correct. I suspect you are encountering MCPE-1982. To make sure, perhaps you could try putting all your entities in minecarts to restrict their movement. (Remove any rails underneath the minecarts... the entities might still be able to control the minecart & move it otherwise.) Yeah, it's kind of expensive, but if MCPE-8002 was still a thing, then the entities (including the minecarts) would still despawn. If MCPE-8002 IS fixed like the devs think it is, then the entities shouldn't despawn or be able to escape. I also recommend making the pens out of a non-suffocating block if they aren't already so that if the entities start to escape they won't suffocate in the walls.
@unknown, you're probably also experiencing MCPE-1982. As for the villager-door-thing, that sounds like a completely separate issue. I'm not sure if it is a bug, though. I think villagers prefer houses that are well-lit, so if that house has the brightest interior, that might be why they are all going into the same place. It migth also be because the other houses are so far away they count as a separate village, so the villagers consider that one house to be the only house in their village. I know there are some various bugs relating to villages & villagers right now. Try searching the bug tracker for all open/reopened tickets relating to "villager" or "village" and see if anything sounds like the problem you are experiencing.

SuperGeniusZeb do you think the issue with villagers despawning is now related to a realms-specific bug? I posted over at MCPE-21416. I have a villager "barn" where they all live in minecarts in little slots against the walls. When I logged in tonight they were just gone. Along with all my animals. Poof. Minecarts are gone as well. So much wasted time, and so many wasted resources (gold apples ain't exactly cheap when you are replacing your villagers with converted zombies for the 3rd time).

SuperGeniusZeb do you think the issue with villagers despawning is now related to a realms-specific bug? I posted over at MCPE-21416. I have a villager "barn" where they all live in minecarts in little slots against the walls. When I logged in tonight they were just gone. Along with all my animals. Poof. Minecarts are gone as well. So much wasted time, and so many wasted resources (gold apples ain't exactly cheap when you are replacing your villagers with converted zombies for the 3rd time).

Same experiences here using Windows 10 edition. Animals clustering and both my (realm owner) and another player's domesticated animal mobs vanishing upon returning from a foray into the nether. Dogs, sheep, cows, horses...

Same experiences here using Windows 10 edition. Animals clustering and both my (realm owner) and another player's domesticated animal mobs vanishing upon returning from a foray into the nether. Dogs, sheep, cows, horses...

I'm still having problems with tamed, enclosed horses disappearing on my bedrock edition/better with friends, realm. I had two different enclosures. One of them had my special horses that I use often, and the other enclosure had all of our extra horses.
I noticed that within a few days in real life, many of the "extra" horses disappeared, to which I figured some of my realm friends must've taken and left somewhere though no one would admit to it (though looking back at it now may have been them disappearing). Then all of the sudden today I get on and both of my good horses that had diamond armor for were both gone. I know no one would've taken them because we all have really good horses with most having diamond armor. Other members (btw there are 5 of us) are having the same problems at different times where our tamed horses are disappearing. I had already taken precautions for keeping them from suffocating in blocks by using fence and stone walls so I know they're not just dying.
I don't know what patch level this is at but its whatever the current "better with friends" version is on xbox one (three of us play on xbox one, one of us on ipad, and one of us on android).

I'm still having problems with tamed, enclosed horses disappearing on my bedrock edition/better with friends, realm. I had two different enclosures. One of them had my special horses that I use often, and the other enclosure had all of our extra horses.
I noticed that within a few days in real life, many of the "extra" horses disappeared, to which I figured some of my realm friends must've taken and left somewhere though no one would admit to it (though looking back at it now may have been them disappearing). Then all of the sudden today I get on and both of my good horses that had diamond armor for were both gone. I know no one would've taken them because we all have really good horses with most having diamond armor. Other members (btw there are 5 of us) are having the same problems at different times where our tamed horses are disappearing. I had already taken precautions for keeping them from suffocating in blocks by using fence and stone walls so I know they're not just dying.
I don't know what patch level this is at but its whatever the current "better with friends" version is on xbox one (three of us play on xbox one, one of us on ipad, and one of us on android).

Note, this bug seems to be avoided if the animals are in a ticking area. We have quite a few pens in a ticking area on our realms server and it does not occur. Prior to setting the ticking area, they would periodically disappear.
It seems related to memory cleanup when the chunks get unloaded. Putting them in a ticking area works around this by keeping them in memory at all times when the game is running.

Note, this bug seems to be avoided if the animals are in a ticking area. We have quite a few pens in a ticking area on our realms server and it does not occur. Prior to setting the ticking area, they would periodically disappear.
It seems related to memory cleanup when the chunks get unloaded. Putting them in a ticking area works around this by keeping them in memory at all times when the game is running.

Well that sounds like it would work but sadly I'm trying to leave cheats off so that I can get still get achievements.
They could fix this if they made all tamed animals and the chunk that they sit in was automatically a ticking area of 1x1 chunk. That would be nice. Not sure what their current fix did but it seems to still be a problem for me.

Well that sounds like it would work but sadly I'm trying to leave cheats off so that I can get still get achievements.
They could fix this if they made all tamed animals and the chunk that they sit in was automatically a ticking area of 1x1 chunk. That would be nice. Not sure what their current fix did but it seems to still be a problem for me.

i'm waiting for golden apples so i don't have to make a new world
On Fri, Nov 27, 2015 at 11:57 PM, Ima homer (JIRA) <[email protected]> wrote:
> Ima homer <https://bugs.mojang.com/secure/ViewProfile.jspa?name=ImaHomer>
> commented on an issue Re: Animals and NPCs despawn randomly
> <https://bugs.mojang.com/browse/MCPE-8002>
>
> Windows 10 Beta - I have had to reseed my village several times. I have a
> large house with no doors that held my 30 villagers. I had empty houses
> with doors. All 30 villagers slowly disappeared. i switched to createive,
> put in 12 villagers, and they bred up to 30 again, then slowly dwindled to
> zero. had pig, chicken and cow farms. one day i looked they were full, the
> next they were completely empty. This is my biggest outstanding issue as
> well. The villagers aren't a big deal since there isnt trading yet, but the
> animals are a huge pain.
> [image: Add Comment]
> <https://bugs.mojang.com/browse/MCPE-8002#add-comment> Add Comment
> <https://bugs.mojang.com/browse/MCPE-8002#add-comment>
> Minecraft Pocket Edition & Windows 10 Beta Edition
> <https://bugs.mojang.com/browse/MCPE> / [image: Bug]
> <https://bugs.mojang.com/browse/MCPE-8002> MCPE-8002
> <https://bugs.mojang.com/browse/MCPE-8002> Animals and NPCs despawn
> randomly <https://bugs.mojang.com/browse/MCPE-8002>
> First pic is of the cow-farm; every powered rail had a cow in a
> minecart...somehow two whole rows disappeared completely, without a trace
> of the minecarts or cows.
>
> Next two are pictures of the underground villiage where despawning
> villiagers were supposed to go.
>
> The rest after that would be some of the villiagers' holding cells where
> they are stayin...
> This message was sent by Atlassian JIRA (v6.1.6#6162-sha1:7af547c) [image:
> Atlassian logo]
>

i'm waiting for golden apples so i don't have to make a new world
On Fri, Nov 27, 2015 at 11:57 PM, Ima homer (JIRA) <[email protected]> wrote:
> Ima homer <https://bugs.mojang.com/secure/ViewProfile.jspa?name=ImaHomer>
> commented on an issue Re: Animals and NPCs despawn randomly
> <https://bugs.mojang.com/browse/MCPE-8002>
>
> Windows 10 Beta - I have had to reseed my village several times. I have a
> large house with no doors that held my 30 villagers. I had empty houses
> with doors. All 30 villagers slowly disappeared. i switched to createive,
> put in 12 villagers, and they bred up to 30 again, then slowly dwindled to
> zero. had pig, chicken and cow farms. one day i looked they were full, the
> next they were completely empty. This is my biggest outstanding issue as
> well. The villagers aren't a big deal since there isnt trading yet, but the
> animals are a huge pain.
> [image: Add Comment]
> <https://bugs.mojang.com/browse/MCPE-8002#add-comment> Add Comment
> <https://bugs.mojang.com/browse/MCPE-8002#add-comment>
> Minecraft Pocket Edition & Windows 10 Beta Edition
> <https://bugs.mojang.com/browse/MCPE> / [image: Bug]
> <https://bugs.mojang.com/browse/MCPE-8002> MCPE-8002
> <https://bugs.mojang.com/browse/MCPE-8002> Animals and NPCs despawn
> randomly <https://bugs.mojang.com/browse/MCPE-8002>
> First pic is of the cow-farm; every powered rail had a cow in a
> minecart...somehow two whole rows disappeared completely, without a trace
> of the minecarts or cows.
>
> Next two are pictures of the underground villiage where despawning
> villiagers were supposed to go.
>
> The rest after that would be some of the villiagers' holding cells where
> they are stayin...
> This message was sent by Atlassian JIRA (v6.1.6#6162-sha1:7af547c) [image:
> Atlassian logo]
>

I am playing on 1.10.0.07 on Android and this is still an issue I am having.

I am playing on 1.10.0.07 on Android and this is still an issue I am having.

I’m playing on switch version 1.12.0 and my sheep in a 12 by 12 fenced in area just depawned and I didn’t even leave the chunk.

I’m playing on switch version 1.12.0 and my sheep in a 12 by 12 fenced in area just depawned and I didn’t even leave the chunk.

I found that this issue was caused for me by closing out of the game without hitting save & quit first. I am using version 1.12.0 on Android.

I found that this issue was caused for me by closing out of the game without hitting save & quit first. I am using version 1.12.0 on Android.
For the ongoing issue (along with some workarounds) please refer to MCPE-21416.
For the ongoing issue (along with some workarounds) please refer to MCPE-21416.