[BUG] Seasons not showing in Library

Always include the release (year) of s01e01 in the series folder name, as detailed in https://support.plex.tv/articles/naming-and-organizing-your-tv-show-files/

Try this, then perform a Plex Dance with the whole show.

P.S. I hope you added only the folder TV to the Plex library, and not each series folder individually.