New albums not being added.

Since about a week ago, new albums don't show up in my subsonic installation anymore.
It was working fine before, and has in fact worked fine for almost ten years.
Manually triggering the media folder scan doesn't work, neither does removing and re-adding the folder. I have also tried creating a new folder and moved all the music to that folder, which doesn't work either.
Any ideas for what I can try to troubleshoot this?
It was working fine before, and has in fact worked fine for almost ten years.
Manually triggering the media folder scan doesn't work, neither does removing and re-adding the folder. I have also tried creating a new folder and moved all the music to that folder, which doesn't work either.
Any ideas for what I can try to troubleshoot this?