After you changed it to the TVDB show order did you manually refresh the metadata? Sometimes it doesn’t scan automatically
You may have to Plex dance ← click
If you still get nothing, I would create a temp tv library and put it in that to see if it works there. I’ve seen libraries become corrupted before
Lastly, I would try a manual scan and then upload your logs here afterwards
Enable debug only not verbose and download the zip from the troubleshooting section in the sever settings
I wouldn’t consider nuking the server until you have a better explanation as to what’s happening
