Amazon and Netflix shows have a looooong end credits area due to their translation and dubbing credits.
Watching such videos to their legit end does not register as a completed episode.
There is no way to automatically fix this today except to manually mark them as watched.
Is there a way where there was a button to mark the episode as done if it’s near the end and move to the next episode. This is possible on iPhone & iPad but missing in tvOS.
Alternatively tune the “considered as watched” threshold to account for Amazon and Netflix.