My thread on the topic is https://forums.plex.tv/t/playback-error-this-live-tv-session-has-ended/758776
The problem—if it’s the same—is still outstanding, i.e. NO fix released. The Plex Team Member contact has been sa2000. I was told the error takes this form in the server log, e.g.
WARN - Could not convert "duration" ("4294967295000") to the correct type
