Bees can fly beneath y = 0 and sit down in the void looking as if they were sitting on the ground.
Although this bug is not very harmful in the normal world, it can be a serious problem in a void, buffet "floating islands" or similar type of world.
I think it should be impossible for a bee to fly beneath y = 0;
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duplicates 1
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Can confirm this as an issue. It seems as if bees can land at any y-position <= 0, like you said. Bees that freeze in the void continue to have an "OnGround" value set to 0, indicating they shouldn't have landed. Bees summoned under y = 0 freeze automatically and bees that fly from y > 0 to y < 0 freeze after about 5 seconds of being in the region. After landing in the void, bees act as if their AI is disabled. After a frozen bee is teleported back above y = 0, their AI returns.
Thank you for your report!
We're actually already tracking this issue in MC-159350, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.