Hi there. I have noticed the following bug:
When I am parked at a stand (pre-flight) I usually activate the "Operate Stairways" while I am getting my flight settings done.
Once I then activate the "request boarding" the passengers arrive in the small bus which is usually used for the crew.
This only happens when I set the stairs prior to activating the boarding process. If I dont operate the stairs prior to the boarding process then all works fine and the passengers arrive in the larger passenger bus.
I can upload a screen shot later if that helps, as I am currently not at home.