updating tv show information

I’ve had an issue that’s a moderate annoyance for a while now. As an example, say I have the simpsons season 1-19. Then a new season comes out so I add season 20. When I add the files, using the same format as every other show, kodi refuses to acknowledge their presence until I press ‘c’ and go to tv show information and then update the show information.

Doing this works, the new season shows up with all relevant information. The problem is it resets my watched shows all back to unwatched.

What’s a better way of doing this?