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Hello, this has been ongoing for quite some time, but only recently observed what really was happening. Occasionally I’d notice a movie marked as played, when I hadn’t watched it at all. Recently noticed it was specific to movies that I had seen a trailer for previously within Plex.
I found this prior thread that someone else reported:
https://forums.plex.tv/t/movies-marked-as-played-if-the-trailer-has-been-viewed/296565
I wanted to add more details to what I’ve observed on this…
for me, it seems to be for movies where I have watched the trailer prior to having the movie in my collection.  So if I see trailer for movie A and movie B… and then on a future date movie A or movie B get added to my library, they will be added in a watched status.
Hopefully this can help someone identify and/or reproduce since it seemed there was no luck in the attached thread. I’m happy to provide any more details as required.