Dont worry, its being looked into, Plex notified us in another post that they’re aware of the issue. May take awhile to sort though. The fix itself from plex maybe quick but Sony/Microfsoft have a certification process before any patchs for games and apps can be rolled out. Which can soemtimes take awhile.
Other post - Plex only outputting stereo since 8/13/19 PS4 update