[MC-92729] Horses spawn in blocks during world generation, causing them to suffocate

The bug

When I created a minecraft world, I was next to some horses. Two of the horses suffocated to death since they spawned inside blocks. Also, the horse animation was a little bit off.

How to reproduce

Seed: 2154973
World Type: Default
Coordinates: /tp -129797 70 -3328 0 90

Code analysis

Based on 1.11.2 decompiled using MCP 9.35 rc1

The problem seems to be that the method net.minecraft.world.WorldEntitySpawner.performWorldGenSpawning(World, Biome, int, int, int, int, Random), which is called when a chunk is populated, does not test if the entity it wants to spawn is colliding before spawning it in.

Related issues

is duplicated by

MC-91158 baby Horse suffocating in a block upn generating a new world

MC-97262 Horses can spawn in walls

MC-120998 Horses spawn on the edge of the montains and die suffocated

MC-125137 Mobs spawning and immediately suffocating

relates to

MC-96994 Mobs spawning in corner of blocks

MC-61535 Horse breeding: Foal looks just like an adult horse

MC-125682 Turtles spawn stuck in blocks, taking damage

Attachments

Comments

migrated 2015-11-15T04:47:17Z

[media]

migrated 2015-11-15T04:54:28Z

By the way, if you need to reproduce, seed in 15w46a is ILoveMushroomBiomes

[Mod]Les3awe 2015-11-15T04:59:35Z

Confirmed.

[Mod]Les3awe 2015-11-15T06:08:06Z

This issue relates to MC-13632

kumasasa 2015-11-15T09:02:40Z

Please provide seed and coordinates.

[Mod]Les3awe 2015-11-15T10:10:33Z

Seed:
ILoveMushroomBiomes(1682752134)

World Type: Default

X/Y/Z:
-257 76 -61

Also affects Windows 10

migrated 2015-11-15T15:32:07Z

Oh, the horses were around -250 75 -60. You're probably right.

[Mod]Les3awe 2015-11-20T10:57:10Z

Confirmed for 15w47b

marcono1234 2015-11-21T14:04:54Z

Confirmed for

15w47c

migrated 2016-02-16T18:55:32Z

confirmed for 16w07a

migrated 2016-10-22T20:55:29Z

Confirmed 16w42a

marcono1234 2017-02-16T17:20:36Z

Removed the previously provided seed and coordinates because it looks like horses were not spawning there anymore.

migrated 2017-06-11T22:36:01Z

Confirmed on 1.12. As horses generally spawn on plain biome it is a rare case. But it can be seen when they spawn on mountainous region or on mountain like landscape. Similar to the Llama case.

migrated 2018-04-28T00:15:45Z

This happens as well with horses that come from nether portal.

Shoud I create an issue?

I think it already exists and is closed:

https://bugs.mojang.com/browse/MC-13734?focusedCommentId=449442&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-449442

I'm commenting here as well since MC-13734 is already resolved

pokechu22 2018-04-28T00:19:53Z

You want MC-80032. MC-13734 was caused by the minecart not teleporting the horse, but I've linked it as related to MC-80032 so that that can be found better; I've also linked this as related to MC-80032.

wobst.michael 2018-11-18T09:12:43Z

Can this still be reproduced in 1.13.2 and higher?

migrated 2018-11-18T09:43:21Z

I've had several horses suffocated not just during world generation but upon reloading a server where the horse is standing in a corner of a stable or next to a wall.

marcono1234 2018-11-21T15:28:15Z

@@unknown, that sounds like MC-2025 and is not part of this report.

wobst.michael 2021-02-03T18:34:56Z

Can this still be reproduced in 21w05 or later?

violine1101 2021-02-05T13:51:31Z

If you're able to reproduce, please provide a new seed and coordinates, the one in the description no longer works.