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Bounty not awarded automatically - bug?

I think this question's revisions and timeline may reveal a bug in the bounty system. From this answer

If the bounty starter accepted an answer during the bounty period, that answer is awarded the bounty.

This appears to be the case here, so I'd expect the bounty to be awarded. Is this a bug in the bounty system?

I'm not too fussed about the actual bounty here (I'd answered the question before the bounty was offered anyway), it's just that it'd be good to either fix the bug or improve the documentation I guess.