Placing a beehive or bee nest directly on top a campfire with a block that has collision will prevent the bees from pathfinding to the hive/nest. If the bee is next to the hive/nest they will still enter.
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I can confirm that bees won't return to a nest that has a campfire directly below it and an oak leaf block above it in 1.17.1 pre-release 2. This also seems to occur in 1.16.5. Maybe it's caused by the bee trying to avoid being burnt by the campfire?
Can confirm as of 1.17.1 Pre-release 1.