Make Jellyfin use original air date?

[Backwoods Genius]

You have to make sure that your library metadata providers are ordered so that the provider that has your desired order is the top.

And you may need to "replace all metadata" when refreshing.

Done that. Even disabled everything but TVDB. It still gets it wrong. I tidied up the file names by removing "Guest" so that didn't clutter the search. That made a difference, it pulled in all the correct thumbnails. But it still mixed up the names and plots in the player. And looking at the nfos, it was somehow pulling in the wrong episode id despite having the correct SxxExx and guest name.

So the only way I was able to fix it was by deleting all the nfos and manually adding the correct tvdbid to every video title.