personal media, the legacay agent and TMDB are all written in a different codebase which can’t work with new agent in the same library
Can you provide some examples of what will not match. (miniseries never will since they are TV shows by nature)
“(Library) Manually unmatched items in Plex Movie libraries would get rematched when refreshing” was a fix in 1.22.0.4136 are you doing a scan for new files or just refreshing metadata.
Can I ask what the GUID is of one of the item with the issue. Get Info then View XML then in the XML there will be something like guid="tv.plex.agents.none://26210"