Try Plex Dancing the entire series. That will clean out old/bad metadata from the Plex Media Server database, which might be preventing a correct match.
If you really want to dig into the details, you can look at the com.plexapp.agents.thetvdb.log log files. They’ll show what metadata Plex is pulling for the shows.
For example, the TMDB ID for s01e01, What Animals are Saying, is 6665702. In the log file, you should see a query for https://tvdb2.plex.tv/episodes/6665702?lang=en, which is your Plex server pulling the info from servers at Plex.
tvdb2.plex.tv data
{“data”:{“id”:6665702,“airedSeason”:1,“airedSeasonID”:762430,“airedEpisodeNumber”:1,“episodeName”:“What Are Animals Saying?”,“firstAired”:“2018-04-25”,“guestStars”:,“directors”:,“writers”:,“overview”:“The series premiere examines animal communication. Some animals demonstrate they can learn human language—like Chaser the dog, who recognizes hundreds of words, and Kanzi the gorilla, who understands some English spoken in context. Included: researchers who are deciphering how animals share information critical to their survival—from a cacophony of ultrasonic bat squeaks to spider thumps and mice mating songs.”,“language”:{“episodeName”:“en”,“overview”:“en”},“productionCode”:“”,“showUrl”:“”,“lastUpdated”:1524773480,“dvdDiscid”:“”,“dvdSeason”:null,“dvdEpisodeNumber”:null,“dvdChapter”:null,“absoluteNumber”:null,“filename”:“episodes/346741/6665702.jpg”,“seriesId”:346741,“lastUpdatedBy”:1,“airsAfterSeason”:null,“airsBeforeSeason”:null,“airsBeforeEpisode”:null,“imdbId”:“”,“contentRating”:“TV-G”,“thumbAuthor”:1,“thumbAdded”:“2019-11-13 13:07:42”,“thumbWidth”:“640”,“thumbHeight”:“360”,“siteRating”:0,“siteRatingCount”:0,“isMovie”:0}}
FWIW, I ran a quick test on my system. It recognized the show straight away, no Fix Match needed. Naming structure: /TV Shows/Nova Wonders/Season 01/Nova Wonders - S01E01.mkv
