If running v1.32.8, then restart Plex Media Server. The scanner/agent does not always initialize correctly. The workaround is to restart PMS. The reports I’ve seen say the bug affects all files, not just those using edition support, but it won’t hurt anything to restart PMS.
The bug is fixed in 1.40, currently in beta. Read the release notes before installing, as there are some database changes in 1.40.
If using TMDB/IMDB IDs, they must be in curly braces to be recognized. Also, all the misc info at the end of the file should be in one square bracket, not several.
Plex Dance the movie after any renaming/reorganizing… The process clears out old / incorrect matching information from the Plex database.
FWIW, this works on my systems:
In Movies library:
/Star Trek The Motion Picture (1979)
../Star Trek The Motion Picture (1979) {edition-Director's Cut}.mkv
../Star Trek The Motion Picture (1979) {edition-Theatrical}.mkv
In my 4K movies library:
/Star Trek (1979) {edition-Director's Cut} [2160p.DV7.06.HDR10]
../Star Trek (1979) {edition-Director's Cut} [2160p.DV7.06.HDR10].mkv