Some setups, much easier than others, can cause bees to hit a corner, and cease functioning.
This happens very quickly with end rods, it happens quickly with walls, slower with panes, and rarely, but still occurs, even in a wider setup as in the youtube video shared in the link below.
This happening at all will hurt the rates of any concept of automated farming of honeycombs/honey bottles.
This is separate but similar, to them losing their AI when reaching a certain distance away from a nest. The difference is that, bees that have lost their nest, and therefore lost their AI, can be led back to their nest, and will go inside.
These bees I'm reporting, are losing AI, and are within range still, of the nest they had been going in and out of successfully until they "died" in the corner.
EDIT: After breaking the flower beneath a "dead" bee, they regained functionality again. This doesn't change the fact that it hurts rates of a farm (as it isn't practical to go around all day and replace flowers) , but I hope it helps find a cause.
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Duplicate of MC-159447

No, this is not a duplicate of MC-159447. That bug is to do with bees not understanding the vertically extended hitbox of fences and walls. This bug is with them completely losing their pathfinding sometimes when they touch the corner of two blocks.

Another note to point out that this isn't a duplicate of MC-159447. Bees that hit a fence post while following a player holding a flower, triggers that bug to occur, however, showing a flower to one of the "dead" bees I'm reporting, causes them to path towards the flower (me as the player) with no issue, but when the flower is hidden again, the bee remains nonfunctional.

In 20w11a

In 20w12a

In 1.16 Pre 3

Can confirm in 1.17.1.

Playing on a Realm in 1.19 , tried to lead the bees away from the corners and they were still "dead". This was occurring in a room with normal blocks, not fences or walls.