Plex TV Series show not found, But it is in TVDB

Nothing interesting or remarkable AFAIK.
/Cartoons/Looney Tunes folder. Cartoons is the library
filterp5

Previous agents found this as thetvdb shorts series without any intervention on my part. I did not ever even have to “fix match”. It just worked. Did not need the first year (1929) in anything either.

EDIT: I did do an old fashioned “plex dance” - rename library folder, delete library from plex, re-add library, before I got “stuck” on this issue.