For whatever reason allays are attracted to floor/ceiling trapdoors and get “glued” to them, spinning around on the spot. This state is not permanent though but happens pretty regularly and last for considerable amount of time. Looks to me like pathfinding issue.
Environment
Tested on 1.21.11. Creative Mode.
Linked issues
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Comments 3
Hi!
Thank you for your report!
We're already tracking this issue at MC-252837, so I will resolve and link this ticket as a Duplicate.
I suggest also to browse through the main issue for potential fixes.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Tested in Survival - same behavior.