I’m not aware of another way to resolve the problem.
The problem is the actor is listed with two different IDs in the Plex database. The only way I know to correct things is to refresh the metadata. There is probably some way to fix things via SQL queries & edits. However, that is a) well out of my skill set, and b) seems very labor intensive.
Plex should let you split apart the movies.
Curious, how did you differentiate between the extended & regular release? Edit the Title field for the extended release? See this post, discussing different versions of a movie. That should survive a metadata refresh.
