Peter Lusztig

If there is a block next to the place where rabbit wants to jump, then it won't succeed.

It can be very annoying, when it's sunset, and you're almost at your bed, but the rabbit is unable to jump 1 block high. 🙂

It can be a pathfinding issue, because sometimes they can jump successfully. Sometimes they remain in the air, but it's just a server lag. 🙂
Here is a video:
https://drive.google.com/file/d/1osGw9GbR5cCEjkcxC_r9pZfxs5bE1EPN/view?usp=sharing

For me in Pre-release 5 version: adult rabbits can't jump 1 block high. It tried to follow me when I held a carrot, but it cannot jump up 1 block of dirt. It was just jumping again and again, but it remained at the same place. Sad, because I tried to lead it to my village...

Yesterday evening I tested with the newest snapshot. I set view-distance to 10, so I tested it with deafult settings.

It was a bit more difficult to reproduce the bug. But it still exists!

The scenario and the seed was the same: fresh new multiplayer server world with the seed above. I had to wander around 10 minutes with many disconnects/reconnects, but finally 2 wolves were duplicated.

Latest log attached:

Hi @@unknown,

It's a fresh new world, so it's not big (18MB), but max. 10MB is attachable here.
So here you can download:
https://www.dropbox.com/s/thpbgc6dcts5gc6/Test_Experimental.zip?dl=0
I hope it works, because I already deleted it before. Just I restored from Recycle bin. 🙂

@@unknown: I have a simple business laptop
Dell Latitude E5470
Processor: Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz (4 CPUs), ~2.5GHz
Memory: 8192MB RAM
Video: Intel(R) HD Graphics 520

It's not a gamer machine, I know. 🙂

@@unknown: unfortunately it's very easy to reproduce in fresh new world, with the latest snapshot, too. I mentioned earlier in an other ticket or in this one, I don't know. 🙂
5 minutes of playing is more than enough...

Lets see:

1. I created a fresh new multiplayer server world with the seed: 5000000123456

   • I played with view distance = 16, here is the server.properties

1. I located the nearest village and teleported myself to there: [-463.5, 80.0, -943.5]

   • unfortunately I died at first, because the game loaded the chunks too slow and I I fell out from the world or similar...

2. Again I tped myself to the village

3. I summoned 10 cows and 30 chickens

4. I disconnected and reconnected

   • here I got 3 keeping entity messages

5. I began to investigate these, so I tped myself to the dupes entities

6. I disconnected and reconnected

   • here I got a lot of keeping entity messages related to chickens

7. I began to investigate these, so I tped myself to the dupes entities

   • A lots of keeping entity messages appeared this time for pigs and wolves

I attach the server.log:

However the server display only one instance of these entities above, these entities are already duplicated: e.g. lamas spit at the "invisible" wolves, they bark, etc.

Please try to reproduce it. It's quite easy. 🙂
It turned out from our previous measurements that maybe the server speed has some relation to duplications, I mean more lags means more dupes.

HTH,
Peter

I would be happy if I could not reproduce it. Just yesterday I tried to kill all duplicated entities from earlier version, one by one. Whan all of the sudden all of my already checked and dupe-killed chickens were duplicated. Each of them, all of the 20 pieces.
However I noticed that much less duplicates appear in the recent versions, but it can! 😞
Maybe because I hatched them from egg earlier? Or why only the chickens? Why not the cows, pigs or wolves? I don't know.
I killed all of them, and summoned 20 new.

For me: opening a barrel caused this crash

@Jeff, I've never heard that relation between the light error and the Nether. However it can be true, who knows? 🙂
About the dupes: your old PC is far more powerful than my business laptop. 🙂
However in single player I haven't had the problem, only in multiplayer. As @Johnibur found, the quantity of duplication seems to have correlation with the system lags.
However I noticed some duplicated entities in server log some years ago, but never so much, than in the current version.
My opinionis that the solution is not killing the dupes manually, but never create them. 🙂 That's what the developers should fix.
Regards,
Peter

Unfortunately this error occurs on a brand new world, too. So it's more complicated than simply deleting all duplicated entities, because they will be duplicated again and again.
See MC-138871 for more info about our tests.
Regards,
Peter

My experience is that they will sit, but you have to wait some seconds. It's also true for wolves. As if the game were too slow.
It's also true for the other way when you try to wake up your wolves for example in a pillager attack. Right click on them, wait 5 seconds, and they will stand up. But don't click again on them, because they will sit down/stand up again to their original position. 🙂

Hi Matthew,
Maybe you're interested in that our tests show these duplications are not related to paintings only.
This can happen in a brand new world without paintings. 🙂
See MC-138871 for more info.
Regards,
Peter

@@unknown you're fantastic! 🙂
I hope they fix this bug soon. According to your measure this event occurs even with render distance=6.
We're used to play on usual business laptops. These are not gamer machines, but MC worked fine till this time. But now even on a dedicated (business laptop) server the new version is very slow.
I don't understand why the duplication is related to speed of server. I think duplication is not acceptable at all. Neither on a slow server, nor on a fast one. 🙂
Again thank you for your measurement, I hope developers can use these results to fix it. 🙂
Cheers,
Peter

@@unknown Attached.

And the 1st server log, which already contains some keeping entity error after the teleport!

This "clickable" teleport coordinate function also needs some improvement, because I fell out of the world till I found the appropriate Y coordinate above the ground... 🙂

@Johnibur that was a good question, so I tested it quickly. 🙂

I made a brand new server world with level-seed=5000000123456

I located the nearest village: (-460; 77; -930)

I summoned 10 cows and 100 chickens.

I disconnected/reconnected and the server already began to display the keeping entity for chickens, donkeys, llamas, creepers. etc.

I restarted the server, but the problem occured again.

Unfortunately the foxes killed many chickens, but cows are duplicated on 2. reconnect I think.

Here are my 10 cows:

I counted at least 12 on this picture, however many of them didn't move yet, so they are not "separated"...
 
As I mentioned, it happened on a brand new world on multiplayer server.

for the 2nd server log

HTH
 

Hi,

For me the issue happens 2 from 3 on multiplayer server. Several stop/restart can help to solve the problem.

My method to reproduce:

1. Join the server

2. Go to a village and find the fenced area usually found in plain villages. Or build a fence yourself.

3. Summon 10 cows in that area

4. Stop server and restart

5. Join again and you have 60-70% chance, that the keeping entity warning appear on command window of server. That means your entities are duplicated, twice as much cows in the area is noticeable. 🙂

Just for sure, you can summon 50 chickens too, in an other fenced area, because on my server this issue affects mostly chickens.

If you notice a sitting cat with 2 heads, you can be sure, it's duplicated.

Even the villagers are often duplicated. Advance their tiers with trade and you can notice the difference: the duplicates have always one less tier than the original.

In some cases unfortunately the original villagers remain invisible, just the duplicates appear.

Since I run the server on the same computer as the client, maybe that's a performance issue, but I'm not sure. However the screen loads much slower than in 1.13.

HTH

In my crash report the affected entity is the ravager and not the rider, however the situation is very similar. During a raid I attacked a beast with my wolves, and suddenly the game crashed.

Entity Type: minecraft:ravager (aqt)

At first connect many mobs were duplicated, however after a disconnect/reconnect everything was correct.

I attempted  many disconnects/reconnects , but it seems to me that the first disconnect (and save) fixed somehow the entities.

OR: is the priest with the golden badge invisible again? I've never met this villager before, maybe it was always invisible? And how could the dog of an other player appear here suddenly? 🙂

Confirmed, even these dark spots can happen on places with torches.

Even you can see a secondary dark spot on the picture: the church has also a dark spot in spite of the torches...

However when I replace torches, these dark spots disappear.

Even monsters spawn on these dark places in spite of the torches!

Confirmed. While Vindicators and witches during a raid try to find a way to a fenced village and they move to water they're just spinning around there forever. Even when I attack them, they're just spinning and spinning. However only vindicators and witches, pillagers never do this.