Mobs suffocate / go through blocks when growing up near a solid block
The bug
Animals seem to suffocate when growing up near a solid block.
How to reproduce
- Create a one block large, two block high enclosure. Use solid blocks like cobble.
- Throw chicken eggs in it until 4 chickens have spawned
- Wait until all chickens are grown up
- Count the chicken
Most of the time all of the chickens have died, sometimes 1 or 2 survive. This happens not only in tight enclosure but also randomly near walls or blocks.
If the blocks are transparent (glass, fence) the animal just can walk through.
I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
See this comment and ticket: https://bugs.mojang.com/browse/MC-1524?focusedCommentId=43968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-43968
Also note DpP41Mf.png
which provides a concrete way to reproduce and an explanation.
Code analysis
Code analysis by Xcom6000 can be found in this comment.
Linked Issues
is duplicated by59
MC-9435Adult chicken die when you pushing them on a solid blockDuplicateMC-9540Adult chickens eventually die if caged near solid blocksDuplicateMC-9626Glitching mob that kill themDuplicateMC-9635Baby chickens glitching into solid blocks and dyingDuplicateMC-9742Mobs suffocating by walking into wallsDuplicateMC-9776Chicken SuffocationDuplicateMC-9805Mobs walking into walls and suffocatingDuplicateMC-9838Baby sheeps disappearDuplicateMC-9976Breaded animals (babies) are disappearing somehow and rare mob spawningDuplicateMC-10012Hitbox for child mobs error when growing upDuplicateMC-10157Animals suffocate in wallsDuplicateMC-10181Dying animalsDuplicateMC-10229Mobs suffocate in walls upon growing into adultsDuplicateMC-10268Mob's collision boxed don't update when they grow, but their hit boxes do EDIT: sorry, its fixed on 07aDuplicateMC-10287Chickens randomly die.DuplicateMC-1037013w06a: Rare Baby Animal hitbox bug, grows up to die by suffocating itself in a wallDuplicateMC-10552Cows getting damage from blocksDuplicateMC-10797Random animal deathDuplicateMC-11492Baby cows used to die in 13w snapshots and sometimes in 1.5 preDuplicateMC-11543Chickens Phasing through walls or dying upon maturity DuplicateMC-11727Chickens crazyDuplicateMC-12208Animals !! get killdDuplicateMC-12481Chickens die as they grow to adultDuplicateMC-13507Animals glitching through blocks when changing from child stage to adult stageDuplicateMC-16239Horses in WallsDuplicateMC-16603Animals growing up outside of fences.DuplicateMC-16950Baby chickens can be pushed through fencesDuplicateMC-17096Baby Chickens Hitboxes seem to be too smallDuplicateMC-19969Baby chickens glitch in to blocks and dieDuplicateMC-22924Baby chickens die when they growDuplicateMC-27175Foal died randomlyDuplicateMC-28116SHeep not regrowing wool, lambs disappearingCannot ReproduceMC-53646Any nee villager get trapped in wall and dieDuplicateMC-68433Animals that grow up near fences get outDuplicateMC-72576Mobs glitch into walls and suffocateDuplicateMC-73317Sheep suffocating in walls or appearing outside themDuplicateMC-77304Villagers Get Stuck In And Suffocate In WallsDuplicateMC-78216Calf Despawns!DuplicateMC-80366Mobs Suffocating When Loading WorldDuplicateMC-92524Growing up mobs can glitch through fence (south-east corner for most times)DuplicateMC-150657Baby animals suffocate when they grow upDuplicateMC-167398make the fence a complete blockDuplicateMC-168590Baby Bees growing up and glitching through blocksDuplicateMC-172571Bee GlitchingDuplicateMC-175788little bees get through edgesDuplicateMC-183131Spontaneously vanishing villagers and bees.DuplicateMC-183139Spontaneously vanishing villagers and bees.DuplicateMC-183179Baby Bees despawn when they grow upDuplicateMC-185783Bees clip through blocks when aging.DuplicateMC-203318beeDuplicateMC-213951Villagers teleporting through glass when they grow upDuplicateMC-221452Baby animal NoClip through fences when they grow up when pushedDuplicateMC-227605mobs still glitch out fences when growingDuplicateMC-229065When baby chickens grow up, they pop up outside(raw chicken farm)DuplicateMC-230739Mobs ghosting through solid blocksDuplicateMC-232496Chickens when growing from adults on a slab with a carpet above them no longer stay in origin blockDuplicateMC-241571Cows glitching through fencesDuplicateMC-248319Cows excaping through fences.DuplicateMC-250012Baby villagers when grown can grow into blocks and take damage/go through wallsDuplicaterelates to8
MC-2025Mobs going out of fenced areas/suffocate in blocks when loading chunksFixedMC-165846Pufferfish can take suffocation damage when bloatingFixedMC-172466Entities misaligning when growing upFixedMC-1524Baby mob collision boxes are too large.FixedMC-129994Pufferfish can go through glass panes by puffing
NormalMC-13632Horses can be pushed into blocks and then take suffocation damageFixedMC-92729Horses spawn in blocks during world generation, causing them to suffocateAwaiting ResponseMC-212284Crammed enitities pushed through blocks when growing to adultsFixed
![[Mod] tryashtar](../../../data/avatars/users/41963.png){kind=small}
- Fixed
Yasuo Iwakura![[Mojang] Panda](../../../data/avatars/users/41658.png)
[Mojang] Panda- 179
- 48
- Confirmed
Low- Gameplay
- Hitboxes
- baby mob
13w06a - 1.20.6
13w06a 13w07a 13w09a 13w09b 1.5 1.5.1 1.5.2 13w17a 13w19a 13w21a 1.6.1 1.6.2 1.7.9 14w32d 1.8 15w44b 15w45a 15w46a 1.11.2 1.12 1.12.1 1.12.2-pre1 1.12.2 18w01a 18w02a 18w03b 1.13-pre2 19w12a 1.14 1.15.1 1.15.2 20w12a 20w19a 1.16.2 1.16.3 1.16.4 20w48a 20w51a 21w03a 21w05a 21w05b 21w07a 21w11a 1.17-rc1 1.17 1.17.1 1.18.1 22w03a 1.18.2 1.19 1.19.1-pre2 1.19.1-pre3 1.19.2 1.19.4 23w14a 1.20-pre6 1.20.6- 21w05a 24w19a
Created Issue:
Animals suffocate when growing up near a solid block
Animals seem to suffocate when growing up near a solid block.
To Reproduce:
1 - Create a one block large, two block high enclosure. Use solid blocks like cobble.
2 - Throw Chicken Eggs in it until 4 chickens have spawned.
3 - Wait until all chickens are grown up
4 - count the chickenMost of the time all of the chickens have died, sometimes 1 or 2 survive.
This happens not only in tight enclosure but also randomly near walls or blocks.
If the Blocks are transparent (Glass, Fence) the animal just can walk through.I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
Animals seem to suffocate when growing up near a solid block.
To Reproduce:
1 - Create a one block large, two block high enclosure. Use solid blocks like cobble.
2 - Throw Chicken Eggs in it until 4 chickens have spawned.
3 - Wait until all chickens are grown up
4 - count the chickenMost of the time all of the chickens have died, sometimes 1 or 2 survive.
This happens not only in tight enclosure but also randomly near walls or blocks.
If the Blocks are transparent (Glass, Fence) the animal just can walk through.I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
See this comment and Ticket:
https://mojang.atlassian.net/browse/MC-1524?focusedCommentId=43968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-43968
Can't link due to missing access rights.
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Animals suffocate / go through blocks when growing up near a solid block
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Wolves and cats will also teleport into lava/magma even if it is impossible to path to the lava/magma and even if it is still a safe distance from the lava/magma.
Wolves riding in minecarts will also "catch on fire" when riding past magma/lava even if the rail is a safe distance from the magma/lava.Minecraft 1.7.9
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Animals seem to suffocate when growing up near a solid block.
To Reproduce:
1 - Create a one block large, two block high enclosure. Use solid blocks like cobble.
2 - Throw Chicken Eggs in it until 4 chickens have spawned.
3 - Wait until all chickens are grown up
4 - count the chickenMost of the time all of the chickens have died, sometimes 1 or 2 survive.
This happens not only in tight enclosure but also randomly near walls or blocks.
If the Blocks are transparent (Glass, Fence) the animal just can walk through.I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
See this comment and Ticket:
https://mojang.atlassian.net/browse/MC-1524?focusedCommentId=43968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-43968
Can't link due to missing access rights.Animals seem to suffocate when growing up near a solid block.
To Reproduce:
1 - Create a one block large, two block high enclosure. Use solid blocks like cobble.
2 - Throw Chicken Eggs in it until 4 chickens have spawned.
3 - Wait until all chickens are grown up
4 - count the chickenMost of the time all of the chickens have died, sometimes 1 or 2 survive.
This happens not only in tight enclosure but also randomly near walls or blocks.
If the Blocks are transparent (Glass, Fence) the animal just can walk through.I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
See this comment and Ticket:
https://bugs.mojang.com/browse/MC-1524?focusedCommentId=43968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-43968
Can't link due to missing access rights.
is duplicated by
relates to
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Animals suffocate / go through blocks when growing up near a solid blockMobs suffocate / go through blocks when growing up near a solid block
![[Mod] Neko](../../../data/avatars/users/92901.png){kind=small}
![[Mod] Pokechu22](../../../data/avatars/users/92931.png){kind=small}
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
Animals seem to suffocate when growing up near a solid block.
To Reproduce:
1 - Create a one block large, two block high enclosure. Use solid blocks like cobble.
2 - Throw Chicken Eggs in it until 4 chickens have spawned.
3 - Wait until all chickens are grown up
4 - count the chickenMost of the time all of the chickens have died, sometimes 1 or 2 survive.
This happens not only in tight enclosure but also randomly near walls or blocks.
If the Blocks are transparent (Glass, Fence) the animal just can walk through.I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
See this comment and Ticket:
https://bugs.mojang.com/browse/MC-1524?focusedCommentId=43968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-43968
Can't link due to missing access rights.The bug
Animals seem to suffocate when growing up near a solid block.
How to reproduce
- Create a one block large, two block high enclosure. Use solid blocks like cobble.
- Throw chicken eggs in it until 4 chickens have spawned
- Wait until all chickens are grown up
- Count the chicken
Most of the time all of the chickens have died, sometimes 1 or 2 survive. This happens not only in tight enclosure but also randomly near walls or blocks.
If the blocks are transparent (glass, fence) the animal just can walk through.I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
See this comment and ticket: https://bugs.mojang.com/browse/MC-1524?focusedCommentId=43968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-43968
Code analysis
Code analysis by Xcom6000 can be found in this comment.
The bug
Animals seem to suffocate when growing up near a solid block.
How to reproduce
- Create a one block large, two block high enclosure. Use solid blocks like cobble.
- Throw chicken eggs in it until 4 chickens have spawned
- Wait until all chickens are grown up
- Count the chicken
Most of the time all of the chickens have died, sometimes 1 or 2 survive. This happens not only in tight enclosure but also randomly near walls or blocks.
If the blocks are transparent (glass, fence) the animal just can walk through.I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
See this comment and ticket: https://bugs.mojang.com/browse/MC-1524?focusedCommentId=43968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-43968
Code analysis
Code analysis by Xcom6000 can be found in this comment.
The bug
Animals seem to suffocate when growing up near a solid block.
How to reproduce
- Create a one block large, two block high enclosure. Use solid blocks like cobble.
- Throw chicken eggs in it until 4 chickens have spawned
- Wait until all chickens are grown up
- Count the chicken
Most of the time all of the chickens have died, sometimes 1 or 2 survive. This happens not only in tight enclosure but also randomly near walls or blocks.
If the blocks are transparent (glass, fence) the animal just can walk through.I think this is probably due to a smaller hitbox, that is immediately enlarged, when the animal grows up.
See this comment and ticket: https://bugs.mojang.com/browse/MC-1524?focusedCommentId=43968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-43968
Also note DpP41Mf.png
which provides a concrete way to reproduce and an explanation.
Code analysis
Code analysis by Xcom6000 can be found in this comment.
relates to
relates to
![[Mojang] Nathan Adams](../../../data/assets/gravatar/dinnerbone.png){kind=small}
![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
![[Mojang] Adrian Östergård](../../../data/assets/gravatar/nighter.jpeg){kind=small}
Low
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![[Mod] Asteraoth](../../../data/avatars/users/92886.png){kind=small}
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![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
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![[Mod] Chandler](../../../data/assets/gravatar/triwonder81.png){kind=small}
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![[Bot] Piston](../../../data/avatars/users/31202.png){kind=small}
![[Mojang] slicedlime](../../../data/assets/gravatar/slicedlime.jpeg){kind=small}
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Me too.
Can this still be reproduced in 21w05 or later?
2021-02-03_19.45.24.png
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![[Mod] Greymagic27](../../../data/avatars/users/92875.png){kind=small}
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![[Mod] markderickson](../../../data/avatars/users/18946.svg){kind=small}
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![[Mod] Les3awe](../../../data/avatars/users/79847.png){kind=small}
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![[Mod] Avoma](../../../data/avatars/users/86198.png){kind=small}
[Mojang] Pandais duplicated by
![[Mod] turbo](../../../data/avatars/users/92867.png){kind=small}
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Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.
Duplicate of MC-9568
(Please one issue per ticket, see the guidelines )
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.
Actually, if I understood it right, this issue has the opposite problem than MC-9568. There the babies eventually get large hitbox (or bounding box) and thus suffocate with stuff inside matter. Here the adults still have baby hitbox. Though the issues are definitely related.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.
I can confirm this is an issue for solid enclosures as well as fenced enclosures as of 13w07a.
I created a 2-block high glass enclosure at my farm for my chickens, since they kept getting stuck inside fence blocks (MC-4661), and kept killing themselves when I didn't use transparent blocks (MC-9568).
On reloading the chunks chickens were still able to escape, even though they had to displace themselves by a full terrain block from their former positions.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 52% of tickets are being closed as duplicate.
Also 13w06a is obsolete, please download new Snapshot at mojang.com.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 52% of tickets are being closed as duplicate.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
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 ....
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 ....
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 ....
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 ....
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.
Duplicate of MC-9568, please use the search function to see if your bug has already been submitted. Currently over 56% of tickets are being closed as duplicate.
Duplicate of MC-9388 and MC-9568, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.
Dublicate of MC-9568?
The mods are not reading this bug correctly. It is the opposite of MC-9568! Not a duplicate.
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.
Maybe duplicate of MC-9568
Still a concern in 14w08a. but the description is inexact. It happens when chickens are jumping to or in a block of air with a solid block above it, their heads then collide with the said block and make them suffocate.
It can easily be reproduced, and therefore confirmed, by making the chicken jump on a block, with a ceiling only 1 meter above it.
I attached an image to show how to reproduce it easily.
Note that this can also happen with a 2 meters high ceiling. The only condition is for the chicken to jump. On the attached image, you could remove the left part of the ceiling and still see the chicken suffocate.
It might be related to MC-9568.
Not sure I completely agree – in this case the animal did not grow up and did not get nudged into a wall. It teleported onto an unsafe block. Even if MC-9568 got fixed, this might still happen.
This issue is a duplicate of MC-9568. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.
I've been unable to reproduce this issue ourselves in 1.13 (though MC-9568 has been reproduced), using the "kill wolves" setup. If you're able to reproduce it, can you specify the version, and any changes to the setup (if you know how to consistently reproduce it)?
This has just happened to me, except there was no minecart and it was a donkey. I'm still mourning I guess and I feel so childish.
It suffocated to the obsidian of the portal.
It looks to me that this issue with the portal is more likely when the portal is not above ground level, instead it has one block height below ground, so that you can walk into it without jumping.
Edit: This may be another instance of the same bug that causes MC-92729 and MC-9568, since those issues have been reopened.
I should have opened a issue, didn't I?
Duplicate of MC-9568
Thank you for your report!
We're actually already tracking this issue in MC-9568, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Thank you for your report!
We're actually already tracking this issue in MC-160520 and MC-9568, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main tickets it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Sounds like MC-9568
This is probably caused by MC-9568.
Does MC-9568 explain your issue?
Thank you for your report!
However, this issue is a Duplicate of MC-9568.
Please use the search function in the future to prevent duplicate reports.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-9568, which is a report that has not been resolved yet.
If you want, you can upvote the parent ticket, and enable watching to receive any updates about it - if you believe you have any information that may be important for this issue, please leave a comment on the parent. Please also use the search function in the future to prevent duplicate reports.
Quick Links:
📓 Issue Guidelines – 🛠 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
💬 Mojira Subreddit – 💬 Mojira Discord
Hey!
Were there any baby bees present when this issue occurred? If so, does MC-9568 describe your issue?
As I started playing the latest snapshot, 21w03a, I realized that my chickens were slowly escaping through the glass barrier surrounding their pen. I utilize entity cramming for both my chicken farm and a cow crusher. I gathered some of my escaped chickens within some fences and noticed that when the baby chicks grew to adults, they got pushed out of the fence wall. I then tested this with the cow crusher, and the same occurred. After the cows grew to adults, they began escaping the one block of space they had been crammed in, and I had about 10 wandering around the yard. I believe this is due to the bug fix MC-9568 that is supposed to prevent mobs from suffocating within walls. I had never noticed that bug before, nor had problems with mobs escaping until today.
I reverted my seed back to 20w51a, and see that it is fine again.
duplicates MC-9568
My issue wasn't a duplicate of MC-9568, but rather a side-effect of the bug fix related to that issue in 21w03a. However, the problem of entities passing through blocks (like fences) is not an issue now in the current snapshot 21w05a. No more escaped cows and chickens!
Duplicate of MC-9568.
Hey there! This is most likely a duplicate of MC-9568.
Thank you for your report!
We're tracking this issue in MC-9568, so this ticket is being resolved and linked as a duplicate.
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Does MC-9568 describe your issue?
I think it's relevant if the solution to MC-9568 is to move to coordinates where they don't take suffocation. I'm not sure though.
Thank you for your report!
We're tracking this issue in MC-9568, so this ticket is being resolved and linked as a duplicate.
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Probably MC-9568 I suggest fences.
This seems to be a duplicate of MC-9568.
Duplicate of MC-9568.
Thank you for your report!
We're tracking this issue in MC-9568, so this ticket is being resolved and linked as a duplicate.
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Thank you for your report!
We're tracking this issue in MC-9568, so this ticket is being resolved and linked as a duplicate.
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Thank you for your report!
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Thank you for your report!
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TLDR:
Various bugs causing MC-2025 have been fixed over the years. The remaining ones listed here are no longer reproducible.
If you are still encountering issues please follow the steps to create a new report for them.
Happy 2025!
The long version:
Hello everyone!
MC-2025 is the most up-voted bug report on the bug tracker. It has been open for over 12 
years with so many contributions and reproductions from so many people.
That the issue is still open after 12 years is not down to a lack of trying to fix it. But the reality is, that there have been a lot of different contributing factors in the code, resulting in many different issues manifesting in a similar way.
As specific causes got fixed, the details on this report have been updated to match the remaining ones.
At this point a lot of them - in fact all that we are aware of - have been fixed!
It's not easy to get a full list of the underlying problems that caused MC-2025 and related issues, since many of them were never separately tracked as an own bug report.
But here is a list of a couple we were able to find:
- Collision boxes having floating point rounding issues at high coordinates
Fixed in 1.5 - Collision boxes being globally changed from several threads
Fixed in 15w38a (1.9) - Collions issues on chunk loading
Fixed in 17w47a (1.13) - Baby mobs growing up next to blocks (
MC-9568)
Fixed in 21w05a (1.17) - Chickens spawned from eggs being in blocks
Fixed in 21w05a (1.17) - Frogs growing up next to blocks (
MC-253791)
Fixed in 24w19a (1.21) - Baby mobs growing up next to blocks below blocks (
MC-252846)
Fixed in 24w19a (1.21)
But there is no doubt there was more!
So, what about the possible reasons that are still listed in the description of this report?
- Floating point inaccuracies
We got no working reproduction steps and nothing that would suggest this is still an issue. - Mobs moving in unloaded chunks
It's questionable this ever was an actual issue. If it was, it has been fixed long ago. - Baby mobs growing up
Fixed as perMC-9568,MC-253791andMC-252846
With all this said, at this point we see no value keeping MC-2025 open.
It looks like the issue described by the title "when loading chunks" has been fixed by larger collision refactors in 17w47a (1.13), so we will be setting this as the fixed version.
The issues of mobs growing up next to blocks getting out was likely the reason MC-2025 got reopened the last time it did, but this has been fixed since.
If you are still encountering issues of this kind, please don't ask for this report to be reopened, but instead follow the steps to create a new report.
Thank you for all the contribution on this and other issues over the years!
Happy 2025 and hpp new er!
This happens also in bigger areas, at least with cows. I created a 2 high sandstone wall with 4x8 area inside, and over 50% of cows died pretty much immediately after growing up.
Something else is wrong with the collision boxes even if the cows survive this. Rest of the cows that were originally small cows (spawned with eggs, but problem occurs also with the ones born "naturally"), died quite rapidly to suffocation when walking around the wall holding a wheat.
Noticed this on a SMP server. Was breeding cows in a fairly large pen, and cows were pushing each other into the walls(2 high stone brick blocks) and suffocating. There was plenty of room in the pen for the cows to go, but they tend to cluster around the sides. And if you have baby cows they will clump together around the closest adult cow, in which they typically force the adult against the wall and it dies.
See also: https://mojang.atlassian.net/browse/MC-9540
I have the same issue: (
MC-9838)This also still happens in 13w09c and another thing to note is when reloading chunks baby mobs will glitch out of the fence if the fence is intersecting in 3 points with a torch on top.
Sorry that I couldn't be more helpful,
jamesloon
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-119Going downward through solid blocks, causing suffocation, death of entries, and entities escapingKeep
MC-2025Going forward through solid blocks, causing suffocation, death of entries, and entities escapingstill 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
"axisalignedbb.minX + (double)this.width". After the hitbox is resized its moved back by the total width amount.
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.
MC-9568 Proposal.txt
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 MC-9568 not fixed.mp4
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. MC-9568 Still not fixed.mp4
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.
Can confirm in 1.19.1-pre3.
Can confirm in 23w14a. This is extremely severe for frogs. They don't even try to escape the block they are stuck in and usually just die of suffocation.
i see this a lot whenever i breed a bunch of cows in fences. i'll get cows roaming around outside the fences because the children grow up near the fence and phase through it.
Video_2024-05-10_18-58-13.mp4
Is this really fixed?EDIT: the pushing out seems to work okay when the mob is squished properly against the wall, with no suffocation. I think the change was just for tadpoles
This report collected a lot of dust over the years.
The core of the issue has been fixed a while back, but it got reopened with changed repo steps.
So this time it was fixed according to the repo steps. Chickens did suffocate when spawned from eggs, because they would end up slightly in blocks. That's fixed, spawning chickens from eggs no longer does that.
Addionally
MC-253791(the frogs) andMC-252846are fixed. Both were issues that were hidden in the duplicates of this issue andMC-2025.Which brings me to the reason for my little rant: If there is new repos for suffocating mobs showing up, please make sure this issue is not reopened, but they are reported as new issues. Otherwise easy to fix issues can get lost behind lots of outdated information of old reports. Thank you! (and thank you for testing if the fix worked!)