I started a bounty for a certain answer to:
I had to wait one week to tell who was going to get the bounty and the bounty just vanished when I missed the narrow 24 h window.
There was just one answer to my question and the answer was accepted.
Couldn't one get an email when it is possible to award the answer?
If the bounty was started by the question owner, and the question owner accepts an answer posted during the bounty period, and the bounty expires without an explicit award then we assume the bounty owner liked the answer they accepted and award it the full bounty amount at the time of bounty expiration.
In my opinion the bold part is awkward. It should be enough with an accepted answer.