I had a similar issue but only with certain TV shows, so I don’t know if it’s the same problem or not
The only way I could fix it was to turn off “prefer local metadata” for the affected library in the advanced settings. There was no embedded metadata so I’m not sure why that worked
Not sure if that’s something you would be willing to live with but it might be worth a try
It fixed the issue for most shows immediately after a metadata refresh but I do remember one show I had to Plex dance to fix it
