I updated my pi4b to LibreELEC (Leia) 9.2 Beta1 on release and have noticed some really odd behaviour with the tv/movie (i don't use music) library.
I'll try and explain this the best I can 
When the rpi updated to 9.2 Beta 1 i noticed that shows that I had viewed where no longer being marked as watched.
I then noticed that the shows that i had been watching the complete season and where previously marked as watched had been marked as not watched, to be clear all previous eps of all seasons had been marked unwatched.
If i watch an ep and i've manually marked it as watched, the previous watched ep is being marked as not watched, if i then manually remark that ep as watch the next ep that i've just watched gets marked as unwatched.
Anyone following this still? 
If i select a season folder and marked it as watched, then enter that folder, each ep gets magically unmarked as watched.
I'm scratching my head here.
Also, nothing that I was previously watching is now being listed in the recently added or next ep is here for you to watch list.