Most mobs (Skeletons are the only exception as far as I know) are unable to pathfind on and/or to carpets with torches underneath.
To reproduce:
Make a floor out of any block you can places torches on (Stone for example)
Place torches on top of the stone
Place carpets on top of the torches
Spawn a few mobs on the carpets
Here's a videoย on Streamable showcasing the bug:ย https://streamable.com/s7qidg
Possibly related toย MC-96319
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I don't think that this should be removed. It allows for extremely compact trading halls just as an example.
Thank you for your report!
We're tracking this issue in MC-157645, so this ticket is being resolved and linked as a duplicate.
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