Mobs temporarily glitch out of fenced areas / into blocks

I can confirm this.

To reproduce:
1. Create fenced off area
2. Fill it with a lot of cows, up until the point they keep pushing eachother to make stand
3. Cows should float outside fence, then rubberband back in.

This behavior is because the client tries to guess the action of the mob. For some reason it guesses incorrectly.

This is also true for sheep, and perhaps for pigs too. I had noticed this bugs initially with fence gates just after the first official release of Minecraft and reported it on getsatisfaction, but I never knew if the report was ever reported to the Mojang team.

New stuff : this bug also concerns cobblestone walls.

Is this still a concern on Minecraft 1.4.4 Pre-Release? If so, please update the version affected.

im not shure if it is or not, i havent had a chance to play the new prerelease

Yes, this bug still exists in Minecraft 1.4.4 pre-release. Please fix it, it's ruining animal breeding...

Not only cows, chicks too.

I can't confirm this with cows. But chickens and pigs escape all the time from my fenced areas. Makes me really sad 😞

Why does this say resolved when it is not?

It think it says "resolved" because they fixed it in a development snapshot version. But that really doesn't count if you ask me.

It is not resolved, still happens in 13w10a =(
My chickens still stucks in fence and teleports over it...

i have cloned this so it shows that it is unresolved MC-11086

I think this is a crowding glitch because you normally cant spawn 2 mobs on 1 block and so the mobs look like there going throught the fence and then get drawedback to the barn (i thinks its a game logic clash)

Reopened.

13w11a, still happens...

Yep, this is very annoying. Happened to me with glass panes, they glitched so far out of the fenced area through my window and chilled in my house until they 'teleport' back.

Glitching out and teleporting backe is not the issue. That's a purely client-side problem.

The issue is that mobs can actually escape fences permanently. I've never seen it happen while all of fenced area chunks are loaded and nearby. I think the issue of mobs escaping only happens when chunks containing portions of the fence are unloaded and then reloaded. Most likely animals pushed up against the fence when the chunk is unloaded will either load on the other side of the fence when the chunk is reloaded or, perhaps breaks in the fence due to unloaded chunks allow animals to walk out.

brandon the second part of what you said is true, however that is a different bug then what i reported. whether it is a client side problem or not doesn't change the fact that it is a bug.

Ryan, yes, I see this bug is specifically about the mobs appearing to come out of the fence only to zip back in later. Mobs escaping permanently is a different issue. Any idea what the bug ID for that one is?

no, i dont know what the id is.

https://mojang.atlassian.net/browse/MC-2025

Just had exactly this issue in 13w24b. Would someone be so kind and update the "Affects Versions" tag?
Thx.

Just so everyone know, this bug is mostly or entirely fixed as an unintentional side effect of my MC-2025 bugfix.
Any questions, comments or concerns about the fix should be posted in the comments section of the link:

MC-2025 Bugfix+ 1.6.2 v23

This bug should definitely be marked as "related to MC-2025" ...

congrats on the name 🙂

Bug is worse in 14w07a.

They also glitch trough transparent block (don't know about solid blocks) for me.
Example: I have a chicken farm where Ihave about 40 chicken locked up in a 1x1x2 area in my world and when I opened the world in one of the latest snapshots they were all spread around the farm.

This glitch is back in a big way in release 1.7.8 and 1.7.9. It is annoying for animals, but deadly and game-breaking when it happens to hostile mobs!!

I have a Skyblock world with several animal pens and a mob farm. Every time I log in using 1.7.8 or 1.7.9, I have animals out of their fences and hostile mobs running all over the place, when they were safely contained upon logout.

Please fix! Especially for hostile mobs!

Also in 1.7.10

Confirmed for 1.8

confirmed for 1.8.1

Confirmed for 1.8.1 using Windows 8.1 OS with the latest version of Java. This is a persisting issue.

Does this still happpen in the 1.9 snapshots?

Fixed for me. Probably due to MC-2025 being fixed. (15w45a)

Probably fixed somewhere between 1.8.1 and 15w45a.

Occurs frequently on Xbox 360 regarding keeping large amounts of zombies enclosed in a brick enclosure in a village.

I updated my server's version to 1.9 from 1.8.9. Immediately after I log on two zombies are attacking me: they came from the hundred zombies that were still in my xp farm collection thing when I stopped the server to update it, so they escaped their cell somehow. I still have a save of the 1.8.9 world if you need it (500mo though), but this seems quite random and not easy to reproduce.
Here is what their 'cell' looks like: http://puu.sh/nq6wD/325b690631.png
They stand on a slab and there is a 1.5 blocks gap (no baby zombies can reach this point).
Sadly I don't feel like this is fixed, or it's a different issue. I didn't notice anything weird in logs (3 entities, not zombies, seemed to have duplicated UUIDs).

LOL Not fixed in 1.9

Confirmed in 1.9 release, I found a sheep stuck in a cobblestone wall.
It was one of the red sheeps that was stuck in the wall i'm looking at in this screenshot http://puu.sh/ns0NT/975ba2cd06.png (i'm facing negative x y and z). It happened on a 1.9 vanilla server which "java -version" is:
java version "1.7.0_95"
OpenJDK Runtime Environment (IcedTea 2.6.4) (7u95-2.6.4-1~deb7u1)
OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode)

I don't know if this happens because of chunk unloading and loading or just if the world stays loaded quite some time.

Definitely confirmed for 1.9. I got similar issues to previous ones multiple times.

@@unknown: You're looking for MC-2025.

Still in 1.9

Video, please.

Yeah, this glitch has been fixed. Now, instead of teleporting back, they just get pushed through completely. Also, it still happens with doors.

I can confirm that my animals are glitching out of the or fenced area, I'm guessing on chunk reload.