I'm running MSFS2024 and the Fenix A320 and not encountered this problem until just recently.
Passengers board OK and are seated correctly - all working fine in that regard.
However, upon arrival and shutting down etc., and I select yes to deboard passengers ... but they just sit there and will not deboard. The aircraft is parked correctly and within the gate limits, and it happens regardless of jetway or stairs. I can hear them deboarding, and the 'text' number gradually decreases until it says all passengers have deboarded - but they remain sitting there the whole time - until right at the end they vanish when all passengers have in theory deboarded.
Any ideas on how to fix this?