[MC-123390] All types of animals spawning in blocks and suffocating during terrain generation

The bug

This bug is distinct from MC-107869, which is about large-hitbox-animals suffocating during world generation.

Small animals like chickens can also suffocate during world generation. However I have only witnessed it at large coordinates.

How to reproduce

Make a new creative world with seed 5426371214953745958
/tp 9101096 105 9099555
→ See nearby chickens suffocating in the walls of extreme hills

Speculation

This might be indicative of underlying world logic using single-precision rather than double-precision floating point to represent entity position values, similar to MC-123388.

Linked issues

relates to 4

MC-92863 /spreadplayers occasionally suffocates players Resolved

MC-107869 Llamas often spawn in blocks during world generation in mountainous regions and die Resolved

MC-140924 Cats spawn in blocks of villages Resolved

MC-167103 Casting issue: Mob spawning loses precision at high coordinates Resolved

Attachments

Comments 6

marcono1234 2017-12-21T17:29:42Z

Could be related to MC-123152

Brian McNamara 2018-01-08T21:00:58Z

still present in 18w01a

violine1101 2018-01-08T21:19:57Z

@unknown, as the ticket is yours, you can update the affected versions by yourself.

muzikbike 2020-07-12T18:54:10Z

This is probably fixed in 1.16-pre1, will need to test

muzikbike 2020-07-12T23:16:05Z

I cant seem to reproduce this with the given seed on 20w22a, can someone find an updated one?

muzikbike 2020-08-17T18:16:33Z

to clarify: I can't find the animals on 20w22a, not that they appear in the correct locations. The spawning mechanics have changed so I need a new seed to test it.