For example, if you spawn a baby zombie by using a spawn egg on a zombie in a boat that is filled (i.e. there's another entity in the boat), the baby zombie will go into the ground and suffocate.
Video
Minecraft 20w51a - Singleplayer 2021-01-05 17-40-33.mp4
Code analysis
Code analysis by Avoma can be found in this comment.
- relates to
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MC-80877 Entity hitbox in vehicle does not become shortened
- Open