I personally have witnessed this behaviour numerous times and now and believe it is nothing more than there being an abundance of nurse bees. Bees cannot sit still, they just have to have something to do and so will move back and forth on the front of the hive as if they are cleaning but it is nothing more than mimicking a cleaning duty. I think its a sign of a healthy hive as they will soon become foragers and will no longer be bored… Just a theory.
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