Noted. I hope we can find a solution soon. The files weren’t visible in the Library as well. My structure is the same as before.
Did you check for video files other than an episode being included in the series folder like @jordillav found that caused their issue?
Just checked and there are no deleted files in the folder.
I meant any other non episode video files.
I’ve the same issue, only seeing limited or sometimes 1 episode whereas previously everything was fine.
Thanks, I tried this method and it seems to be the best solution for now, my Game of Thrones came back in order. I shall try on other glitched TV shows later.
This workaround has fixed my issue too but it’s not ideal. This is clearly a bug. Will it be fixed soon?
We’re looking into this issue. Thanks.
This has been fixed in today’s 8.4.4 update. 
Thanks for your patience.