Simply ‘Unmatch’ the show - The Agent will auto-switch to Personal Media - and Plex will no longer try to match it.
Then, if you have embedded all the correct info in an MP4/M4V file - Edit the Library and enable ‘Prefer Local Metadata’. Refresh Metadata might find it - or The Plex Dance should.
That might do it. Plex can only read and react to metadata within MP4/M4V files - and only if you tell Plex to do so (the real issue is Plex usually is doing that already - when it’s not wanted).
