I can confirm @Elijah_Baley 's method for naming this TV Show will work as such:
Magnum P.I. (2018)/Season 01/Magnum P.I. (2018) - S01E01 -
Do a Plex Dance: The Plex Dance ™
Add the show again and you should get the show information just fine. I believe for reboots or updates to TV shows like this, it would help to add the year in ( ) within the naming scheme to fetch a better result for the title you’re trying to get metadata from.
I hope this helps.