Have never seen this. Can you try this. Mark an entire show as unwatched. Play 1 episode from the show. Fast forward to the end and check that the marked got marked for the whole show. Upload the Plex media server log.
first I moved the folder containing the media to a different location.
Then i rescanned the library, followed by "clean bundles" and empty trash.
After that i re-added the folder to the library and scanned again.
Just wanted to say that 3 years later, I’m getting almost this exact same error, except as I watch an episode, it marks the season as watched. I just paused Simpsons s6e1 partway through, and Plex says I’m partway through every episode of the season.
Confirm this trouble. I have 17-th seasons of Air Crash Investigation and 16-th and 17-th seasons have this trouble. When I mark 16-th season unwatched and then mark S16E01 as watched – the whole season marks as watched. I watch half of first serie in this season and every 10 series now marked as half-watched.
PMS 1.12.1.4885-1046ba8f on the Synology.