Bees seem to get caught on chains. They keep trying to fly right into the block thinking its air. My guess is that its path finding thinks it can travel through it.
Here's a screenshot of the issue on a chain although the bees seem to get stuck when there's no lantern so it's not the lantern.
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Can confirm in 20w51a.

Chains are one of the blocks mentioned in MC-189111; is anyone still able to reproduce this now that that issue has been fixed?
In 1.16 Pre 3