When playing something on Plex one useful feature is being able to turn on a tv in another room and continue watching there too while still playing it on the original location too.
However this seems to mess up scrobbling to Trakt. Even with the first device still playing, if one turns off the second device, Trakt doesn’t seem to pick up the completed watch of the movie or episode. The ending on the second device appears to cancel out both instances. Expected behavior would be that when Plex sends the completed notification from the device that kept playing it that it would pick it up.