I also have this issue for quite a while. I dont remember when it started, but I think it was this year, perhals with the latest LM update? Using the GSX full installer didn't help. I have this issue now almost anytime, P3D V4.5, several airports, payware and ADE generated ones.
The boarding is always OK, it only happens when deboarding. Other operations work. Airplane is the TDS 727, exits have customized positions.
What kind of additional information would help you?
beat regards