When inside a non-full block (e.g slab, fence, wall ...), small mobs (from what I have seen, bees and allays) cease all pathfinding. They no longer move or react to items. If the mob is pushed out of the block, pulled out with a lead, or the block is broken, the mob resumes normal behavior.
MC-251904
Small mobs stop pathfinding when inside a non-full block
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We're tracking this issue in MC-189111 and MC-250983, so this ticket is being resolved and linked as a duplicate.
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