So TMDB isn’t perfect nor is TVDB.
I will try and give specifics.
The show Allo Allo has completely different episodes for the specials on TMDB and TVDB.
I have gone out of my way to match the TMDB for a particular episode.
Plex has it named according to TMDB, Infuse has it named according to TMDB. So If trakt also uses TMDB why when I play it, would it scrobble the episode as it’s shown in TVDB?