The Plex dance is often needed on any change.
. . . .
When you change anything to fix a match it is a good idea to “Plex dance” the files involved:
1 - Move the media to where Plex cannot see it
2 - Refresh the library
3 - Empty Trash
4 - Clean bundles
5 - Move the media back
6 - Refresh the libraryPerform all steps in order and allow each one to finish before starting the next.