While browsing the new actors hub tonight I discovered a strange issue with a specific movie.
The classic horror movie Candyman (1992) doesn’t seem to exist at all for Plex.
I have this movie in my local movie library. It’s correctly matched and I see all the relevant actors on the movie’s page. But if I click on one of the actors, it’s like the movie doesn’t exist at all. It doesn’t appear under the “Movies & Shows in Media Libraries” section, and if I look in the filmography of any of the actors the 1992 Candyman movie is just not there.
Try refreshing the metadata. It sounds to me like your movie might need to be “rematched”, which is what refreshing the metadata. A few months back (year?) Plex updated all the movies’ ID’s, and a library refresh was needed in order to re-match the movie against the modern database ID. If it doesn’t match, then it doesn’t think that the actors in YOUR version of the movie are the same actors that are in other movies.