Mobs suffocate / go through blocks when growing up near a solid block

Still an issue in 13w10a.
This issue exists because of the hitbox bug. The newly grown adult animal keeps the baby-sized hitbox for collision detection, but the adult-sized one for damage/suffocation until you relog. Adult animals with the baby-sized collision box can therefore walk into a wall and suffocate in it.

There are a lot of related bugs which are essentially duplicates. They are all related to the baby/adult collision box mix-up.

This is still happening in the 1.5 pre- release especially with chickens on top of hoppers for me
Edit: SO while I was sitting here typing the original post and a chicken pops up infrount of me. It apears they also are glitching through blocks (glass in my case)

This is related to my post of,,, MC-11349
https://mojang.atlassian.net/browse/MC-11349
which is aparently a duplicate of this according to mods.
https://mojang.atlassian.net/browse/MC-2025
These are also related to it MC-10, MC-18, MC-119, MC-1029, MC-1524, MC-2025, MC-2037, MC-3140, MC-3753, MC-4707, MC-5187, MC-5230, MC-5369, MC-5401, MC-6115, MC-6393, MC-6396, MC-6398, MC-6465, MC-6653, MC-6707, MC-7392, MC-7462, MC-8390, MC-8707, MC-9039, MC-9393, MC-9476, MC-9483, MC-9503, MC-9525, MC-9540, MC-9568, MC-9626 , MC-9635, MC-9742, MC-9753, MC-9772, MC-9777, MC-9805, MC-9838, MC-9894, MC-9926, MC-9976, MC-9988, MC-10012 , MC-10116, MC-10157, MC-10181, MC-10229, MC-10231, MC-10268, MC-10311, MC-10370, MC-10422, MC-10552, MC-10725, MC-10797, MC-10894, MC-11009, MC-11022, MC-11052, MC-11086, MC-11203, MC-11252 ....

Mark This as Duplicate.

Keep MC-119 Going downward through solid blocks, causing suffocation, death of entries, and entities escaping
Keep MC-2025 Going forward through solid blocks, causing suffocation, death of entries, and entities escaping

still present in 13w17a

This is still happening in 1.5.2 full release.
Any and all animals which have a smaller hit box when they are babies than when they are adults, will begin to take suffocation damage when they grow, if they are next to a block.
This is because when they grow, their hit boxes embiggen, taking space inside the solid block.
The animal will become stuck and invariably die.
This will happen in ANY sized pen, not necessarily 1x1 boxes. Because the baby animal simply needs to be standing next to any block at the point of growth.

Stin in 13w21a. MUCH easier to reproduce with horses.

13w25b confirmation. Baby Horses are a pain to look after in a pen due to them getting pushed into solid blocks and suffocating or just walking through fences/non-solid blocks. I really thought that Mojang would have fixed this by now.

A fix for this seems to have been made by people here, on a related issue:
https://mojang.atlassian.net/browse/MC-2025

this seems to happen almost all the time with baby sheep growing up close to a wall and it ruins my sheep farm in survival

Not only does this still happen in 1.7.4, but it's a frightfully common bug and all mobs can do that, not just animals and not just babies. I have a zoo map where I have rooms with mobs of each kind, and each mob has PersistenceRequired:1 and Invincibility:1 tags. If a mob (let's say a cow) is near a thin wall (glass pane, iron bars, doors etc.) and then you quit and reload the world, in most cases it will already be on the other side of the wall. This can also happen if a mob pushes another one into a wall - mobs get stuck in it even if it's a solid thick wall made of 3 layers of stone. Thanks to invincibility tag, mobs didn't suffocate on my map and they were really stuck in the wall, with blackened colours. Squids and bats are especially prone to execute this bug.
Newest snapshot doesn't fix that yet either.

My horse was tethered outside my house and walked up against the wall and just started suffocating. It was free to walk away (not stuck) and the tether was even pulling it away from the wall, yet it stood there and died.

Can't you just make mob's hitboxes (for damage/suffocation) slightly smaller than their collision hitbox to allow room for error? ...or as with players, let them be pushed out of a block when inside it?

This still holds true for the current snapshot 14w05a. I've had a donkey and wolf both suffocate after I accidentally nudged them near a wall.

I just tested this in many versions from 1.6.2 to 14w08a, with 200 chickens in a 1x1 pit. Not even one chicken died when growing up. Can someone who noticed the bug before can test it on a recent snapshot?

This is definitely happening to me in 14w11b with both chickens and cows (haven't tested with pigs). My chickens have a smaller enclosure (2x2) and die more frequently (during gameplay, probably when chunk gets unloaded then loaded). The cows' enclosure is a larger one (approx 8x15) and they seem to only die when I log back into my world.

Not only are animals dying but so are villagers; suffocating or getting stuck in the stupidest spots. I can't stupid proof my village anymore than I already have!

This just happened to one of my donkeys. Donkey got pushed inside a wall, suffocated, and died. All the items inside the donkey's chest flew all over the place and I had no room to store them anywhere.

Happens in 14w32d. My baby cows keeps dying, and I can't repopulate!

This could be my problem. I would have a Baby Cow in an area that has fence for the bottom block, and wood planks on top. I'd leave to do some mob killing and I would come back and discover a missing cow. When I see them grow up, they don't suffocate in the wall or something, but when I am gone and suppose they grow while I'm away, they disappear. There are no drops or evidence of them dying, but they could be despawning.

If your animal can walk a straight 20 blocks in any direction it will despawn. My issue appears to be fixed as of the last update, no more dead chickens! However I now have new issues I didn't have before, ones that were supposedly fixed with this update are now causing ME trouble. WTF

Animals randomly suffocate or appear outside the fence/solid block even when they are already grown.

It's really annoying. I have to breed my animals 2 times a day to prevent extinction.

It appears to be a bug in the loading of the coordinates of the mobs. I did a test in my survival world; I had cows in an underground area, so they were in an area encased by stone. When I logged back in, every single time (as I could see through parts of the world as it was loading, and entities always render before blocks), I saw that they were being damaged. Then, at another time, I had them above ground, enclosed with fences. When j logged back in, or came back from the Nether, some would be outside of the fences. So, I thinkmors a problem in their coordinate locations. Like off by a block, or they can walk through blocks for a bread moment upon loading, then die, or escape like with fences...

So this bug appears when entitles are rendering, nevermind if you've just started the server, logged in or came back from a journey. Please fix it ASAP

But it doesn't appear to happen with Item Frames, which are also entities

Because they kinda cant move 😃

My guess is the problem is related to rounding errors and/or the hit box of the mobs.
Probably what happens is their location gets saved with a very precise floating point number and then when the chunk they're in gets re-loaded, that number gets rounded to something less precise and the mob is moved and they end up in a solid block or on the other side of a fence. The other thing could be that their hit box overlaps with other mobs and there's some sort of algorithm which attempts to keep all mobs a certain distance apart and their location is put to one of those unfavorable locations. The problem could also be a problem of those two things.
Just my two cents.

There might be many reasons. That should be fixed ASAP

Can this be confirmed 1.8.8 onwards? Should consider closing this bug for now until someone can confirm this with a more recent version.

Confirmed.

I have seen this also in 15w46a

This also happens with villagers.

Pigs, Cows, Chicken.... all disappearing frequently. I filled the whole ground of my enclosures with Hoppers to see wether they are despawning or dying.
Hoppers are filling with meat, leather, etc. so it seems they are indeed dying.
Pretty annoying... hope this gets fixed soon

After there was invested so much time to add many new features recently, I hope you will now get rid of some of the ancient nasty bugs like this one

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w43a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.

I can confirm that this is still an issue in 1.11.2.

Pokechu22 helped point out the code where mobs are resized. It happens in EntityAgeable.java in "setScale" (MCP code). This line is called when a mob changes size to an adult. This then calls a method "setSize" (MCP code) in Entity.java where the size is changed. Studying the code it shows clearly that the resizing is done in a very odd fashion.

If the resizing is done towards smaller then the entity simply shrinks without problems keeping the centre position as the reference point, no problems observed. If it's done towards expanding then its done differently and is the reason this problem happens. The expansion strictly expands the current hitbox towards the positive axies as shown here

this.setEntityBoundingBox(new AxisAlignedBB(axisalignedbb.minX, axisalignedbb.minY, axisalignedbb.minZ, axisalignedbb.minX + (double)this.width, axisalignedbb.minY + (double)this.height, axisalignedbb.minZ + (double)this.width));

"axisalignedbb.minX + (double)this.width". After the hitbox is resized its moved back by the total width amount.

this.moveEntity(MoverType.SELF, (double)(f - this.width), 0.0D, (double)(f - this.width));.

Basically moved back by a full expanded amount.

Two observed issues that can be seen by this is
A. The mob expands and shifts its original position.
B. As illustrated in the picture some edge cases results in mobs never being moved properly back and placing them inside other blocks.
https://i.imgur.com/DpP41Mf.png

The proposed fix is to simply change the size of the hitbox based on the centre position. Then check if the entity is overlapping any other hitbox. If its overlapping any other hitbox it should move the entity back out but only by first checking if its not overlapping with the old hitbox (the last check is to make sure that entity's aren't moved out of blocks they were previously occupying).

These two images shows a code proposal.

https://i.imgur.com/8sVcGr2.png
and
https://i.imgur.com/tdyxPtR.png

I had some issues with escapees syill when trying out the code provided by Xcom. I've built on his idea and come up with the attached. The screenshot shows a pen with a mix of iron bars, cobblestone walls, and full blocks in a ring shape, and all of the cows in the pen started as baby variants. I've managed to reproduce this a few times with various combinations of blocks without any animals escaping thus far.

The changed code first sends "null" as the first argument to "this.world.getCollisionBoxes" to prevent it sending nearby entity collision boxes. After that it walks through the list of all block collision boxes that intersect the new entity collision box that did not intersect the old one. It then checks the X and Z axis independently, and if the new collision box collides with the block collision box it moves the new entity collision box in the direction opposite of the relative position to the old entity collision box on that axis only if the old entity collision box completely clears the block collision box on that axis.

It's a bit of a mouthful, but it seems to work.

Affects 1.13-pre2

19w12a

In 20w12a

Affects 1.16

Affects 1.16.1 and 20w27a

Affects 20w29a

Can confirm in 20w48a.

Can confirm in 20w51a.

Not fixed in 21w03a

Indeed not fixed in 21w03a: Ilmango's snapshot video

Confirm for 20w51a

I have been subscribed to this bug for a VERY long time now..

How is it that it has been marked resolved twice now but not actually resolved ?

From the various videos it isn't hard to reproduce / test? 

xisumavoid 21w03a https://youtu.be/P7PncU3lLfI?t=546

Please do not comment on the issue tracker if you do not have additional information to add.

Not fixed in 21w05a

Can confirm, indeed still not fixed in 21w05a.

Thank you for testing this!

When reproducing it in 21w05a, can you confirm that the mobs are not glitched into the blocks before growing up already?
I can currently only get the mobs to grow up into blocks or suffocate if
a) the mobs are partially inside blocks already or
b) there is not enough space to grow into.
For a) the conditions that lead to the mob already being inside blocks should be their own reports. I'm not sure what to do with b), but it at least shouldn't be part of this report.

If it still happens without a) or b) being the reason it would be great to get more precise reproduction steps, like the exact entity coordinates and block configuration.

@[Mojang] Panda
In my previous comment (link to comment) I linked to a video showing this bug happening. From what I can see neither A nor B is the reason that this is happening.

According to the updated video that issue is indeed fixed: https://youtu.be/syRAo-I_600?t=938

But it seems like it introduced a new performance issue along with the bug fix: https://youtu.be/H8PZgqm7fGc?t=678

Seems to depend on how close they are near the wall. If they are very close, they can still suffocate.

If the mob is further away from the wall, it will move away from wall when growing up, preventing it from suffocating. Command I was using is

/summon pig 112.82 78.00 158.25 {Age:-5}

If you summon it with a large negative age you can also push it into the wall before it growing up? I think baby pigs are 0.45 wide, so if it's at 0.82 that puts the side of it's AABB at 1.045, slightly into the wall.

Can confirm in 21w05b.

If there are new issues introduced, please post new issues.

Affects 21w07a

Affects 1.17 Release Candidate 1 per MC-227605.

Can confirm in 1.17.1.

I noticed while trying to make a fox powered chicken cooker that this bug does not often happen for me under normal circumstances, however if there is a carpet on top of a slab that the chicken is growing up into, it moves into the wall and suffocates. the chicken is safely not suffocated if it merely grows up on a slab in an enclosed space without a carpet.
even with one chicken, it still gets shoved into the wall
EDIT: it appears that this is the case not only for carpets, but for mostly any block being above the slab the animal grows up on. it makes them move into the wall

Is this still an issue? Since I cannot reproduce it, although in my survival world, there is something going on with my animals, still researching and testing.

Cows growing up inside a 1x7 space teleport through the walls. They don't seem to suffocate as often as they just pop out the other side. 

Can confirm in 1.19.1-pre2.