I posted a bounty to a fairly corner-case question at new-WindowsImage stalls with 0x8007007E, can't load unattend.dll . Sadly, 30 minutes after posting the bounty, I realized what the answer was. That's fine though, I understand how bounties work.
There are still no other answers to the question, so nobody can get the bounty. But I still get system notifications and emails pleading with me to award the bounty before it expires.
These emails and notifications should only be sent if a bounty can actually be awarded.