[MC-269145] Wool item entities created when shearing a sheep stutter while flying

When shearing a sheep, the wool items created will stutter while flying. This is not the case when shearing mooshrooms or performing other actions which create item entities.

The specific problem is that in net.minecraft.world.entity.animal.Sheep#shear, both the client and server generate random numbers for the velocities of the spawned items. This can be compared with net.minecraft.world.entity.animal.MushroomCow#shear and net.minecraft.world.entity.monster.Bogged#spawnShearedMushrooms, neither of which use locally generated random numbers on either side.

Linked issues

relates to 1

MC-269859 Experience orbs produced by grindstones exhibit stuttering motion during flight Open

Attachments

MC-269145.mp4

Comments 6

oowooglac 2024-03-07T14:58:18Z

I can replicate this problem in version 1.20.4 as well.

Poojh 2024-04-08T18:09:12Z

Relates to MC-269859

BugTracker 2024-04-15T11:43:32Z

This also seems to affect 1.20.5 pre-release. I also noticed that it depends on the color, sometimes it may not stutter, and sometimes it does.

clamlol 2024-12-07T05:02:48Z

Seems fixed in 24w44a.

tryashtar 2024-12-16T05:41:47Z

Although I can confirm the issue seems to be gone in 24w44a, there didn't appear to be any changes to the sheep code in that version, so the code analysis ostensibly still holds. I wonder if anyone has any insight as to why the issue no longer manifests itself?

clamlol 2025-01-03T01:22:04Z

It's worth noting that this is my first attempt at code analysis so it may be that there's something I didn't understand- if so I'd appreciate if someone would clarify things