When a mob looking up or down at other target, it will look at weird angle, they are never looks up or down directly.
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This behavior seems intentional, though because I do not have a source to back that up, I can confirm in 29w04a as well.
Here are steps to reproduce this issue:
Summon a piglin
/summon piglin ~ ~ ~ {NoGravity:1b,IsImmuneToZombification:1b}Summon a wither skeleton directly above it
/summon wither_skeleton ~ ~3 ~ {NoGravity:1b}
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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I can confirm that the mob's AI never directs them to look directly upwards or downwards, but it's possible to bypass this angle limit using /tp commands.