When exiting the beehive/bee nest after the night, bees will be stuck in the block directly in front of the beehive entrance. As far as I know, up to three bees can be stuck in the same block. They only begin searching for flowers after pushing them out of the block.
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We're tracking this issue in MC-252831, so this ticket is being resolved and linked as a duplicate.
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As a workaround, try putting 1 block of air space between the campfire and hive. Having a crop in front of the hive doesn't seem to matter.