[MC-209784] Baby drowned can spawn as chicken jockeys, causing chickens to float in the oceans

The bug

Baby drowned sometimes spawn as chicken jockeys, which causes them to dismount the chicken, chicken just ascends and start randomly swimming around on the sea surface.

Code analysis

Code analysis can be found in this comment.

Linked issues

is duplicated by 2

MC-228442 Chicken Spawning in Ocean (potentially more mobs but unknown.) Resolved

MC-273289 Chickens can spawn underwater Resolved

Attachments

Comments 9

Marcus 2020-12-28T07:21:49Z

It is not really a problem, but yeah pretty weird

Avoma 2021-01-13T18:42:34Z

Can confirm that this is an issue, although this may be intentional. Also affects 20w51a.

ampolive 2021-06-10T21:44:19Z

Affects 1.17 per MC-228442.

ampolive 2021-08-04T14:04:47Z

Can confirm in 1.17.1.

Avoma 2021-11-27T15:32:34Z

Can confirm in 1.18 Release Candidate 3.

aceplante 2022-01-07T15:59:36Z

affects 1.17

ampolive 2022-03-26T23:21:50Z

Code analysis (Mojang mappings, 22w12a):
Drowned#finalizeSpawn(...) extends Zombie#finalizeSpawn(...), and there is no check in the latter method to verify the entity type before setting it to a chicken jockey. Therefore, baby drowned can spawn as chicken jockeys.

Brain81505 2023-03-20T16:23:01Z

Can confirm in 1.19.4

BeeTeeKay 2024-08-08T01:16:02Z

Affects 1.21