There in only one XML file in the behaviors folder being updated by GSX based on the model defined in the aircraft.ini file. The aircraft model listed first (BBJSSW, BBJBW) defines which XML gets updated, the fltsim number does not matter just the first one listed. So, the other model XMls do not get updated, and passengers do not show seated for those aircraft. Not sure what changed PMDG update or GSX update, but it used to work fine.