Help with collections

[zikkrin]

I cannot get new movies automatically added to a preexisting collection, though I'm not sure if this an issue or a result of unclear wording. I have a movies library, and in the administration page I checked this box: "Automatically add to collection: When at least 2 movies have the same collection name, they will be automatically added to the collection". This works; however, I would also expect that new movies added with the same collection name as a preexisting collection would be automatically added to the collection. For instance, if I add the first 4 Harry Potter movies and ask Jellyfin to scan the library, it determines they all belong to the same collection and adds all 4 to the Harry Potter collection. If I then add the 5th movie and scan the library, Jellyfin won't add this new movie to the collection even if it determines the new movie is part of the same box set ID as the previous 4. Am I misunderstanding this setting? Regardless, is there a way to get the functionality I want without manually adding all the movies?