Completed downloads not automatically importing

Sonarr version (exact version): 4.0.8.1874
Mono version (if Sonarr is not running on Windows):
OS: Win10 Pro
Debug logs: PrivateBin
Description of issue:

For the last few days none of my completed downloads are getting imported. I can go into the Wanted page and do a manual import of the completed file, so I know it’s not some kind of permissions or config issue. The logs don’t seem to contain any helpful information. The download appears on the queue until it’s complete and then it disappears, showing in history only as “grabbed”.

I updated to 4.0.8 today and confirmed that this is still occurring.

Edit: Might be worth mentioning that this is happening in Radarr as well. To the best of my recollection I haven’t changed anything about my setup in a while.