Here’s a couple of ways that should work. However, with the first you’ll lose watched/unwatched status. With the second you might lose watched/unwatched status (I don’t know), and you will have to re-share the library if you share with other users.
Idea 1: Plex Dance the entire library. This removes then replaces the movies in the library. This should work, since you said new movies pick up the correct information. You’ll definitely lose watched/unwatched status, since everything appears as a new movie. It won’t mess with what libraries are shared with other users.
I’d test this first with a group of maybe 5 or 10 movies to make sure it works. Also, Plex will have to re-generate any optimized versions, thumbnails, etc.
Idea 2: Create another library (ex: “Movies2”) and pointing it at the same directory as the current library. See if it pulls in desired data. If so, then delete existing library, clean bundles & optimize the database (PMS Settings -> Troubleshooting), then rename the new library to the desired name.
Not sure if you’ll keep watched/unwatched status. Will be a pain if you share libraries with other users, as you’ll have to re-add the library for each user.
