I mentioned before
We stopped matching TV Recordings long time ago and we keep the EPG metadata and when that change happened we advised users to have separate Recording libraries.
The change was announced here
We did have a bug where if a library location was moved then we lost the DVR recording indication - this was fixed sometime ago in PMS 1.26.2
- (DVR) Prevent losing extra data if media moved/renamed within the library (#13483)
The fix would only apply to new recordings.
Also if a show was previously matched with thetvdb then new recordings would also get matched.
Do you have a separate library for TV Recordings ?
Can you look at the media info for the recordings through Plex Web Get Info and see if they have the dvr indication
This shows what the DVR indicator appears as in the Media Info
Could you see if new recordings have this DVR indicator in media info.
If not, setup a new recording library and see if that fixes it for the new recordings
