I use Hide watched in my Trakt library, some new unwatched episodes of series exist -they are not marked as watched-, those series do not appear on my library, unless I disable Hide watched for the library. All other series reappear in my library as a new episode is added -that's the point of using Hide watched with the library.
Using Kodi v18.9 in Arch Linux.
Example series with that issue:
American Gods
Blacklist
The Expanse
I use Hide watched in my Trakt library, some new unwatched episodes of series exist -they are not marked as watched-, those series do not appear on my library, unless I disable Hide watched for the library. All other series reappear in my library as a new episode is added -that's the point of using Hide watched with the library. Using Kodi v18.9 in Arch Linux.
Example series with that issue: American Gods Blacklist The Expanse