asobo handmade default airport.
That's normal: it's an airport that only exists in the Premium versions, so it's encrypted like any other Marketplace airport, so GSX can't read it's parking spots names/positions and can't match them to a jetway, so it cannot recognize it as docked, meaning passengers will be simulated.
All these sort of issues should be fixed once we'll integrate the new navdata API that is coming in SU10. The jetways will still behave wonky (that's a different problem SU10 won't fix), but at least we should be able to read all airports.