Puppy starting to bite tail, should I be concerned?

Hey folks, got a 11.5 week old goldendoodle. Recently, he's started biting and chasing his tail in circles until I intervene. When I leave him alone in pen, all I hear him doing is chasing/biting tail. Is this something to be concerned about, or let him play?

submitted by /u/Ok-Actuary-5377
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