Same here with AS321 and EGNX , no bus and no Pax/Crew
That's likely because the airplane is not configured or it's configured wrongly. If you run the FSDT Live Update now, we added a proper configuration for the new Aerosoft A321/321.
If you tried to customized it manually or downloaded a configuration made by someone else, use the RESET button from the "Configure aircraft" page, to be sure GSX will now use its (now udpated) internal configuration.