The problem is that TVDB only expects the year to be present for SOME shows - those that need it, based on when they were added to the database, and if a conflict was generated at that time. It basically treats the year as part of the show name. 
You’ll sometimes get bad matching if years are included when they aren’t needed. 
Today, shows should only include the year if TVDB displays a year: North and South (1975)
But not if it doesn’t: North and South
The nice thing about @ChuckPa’s recommendation for FileBot is that it can use the year only when necessary. Some other tools that are TVDB-aware can do this too.
Like you, I would really like to include the year consistently. I’m hoping that the new TV scanner will support this. Test the preview and give feedback!
New Plex Media Server TV show/series scanner and agent preview
