the question is why you guys are trying those bugs? Because it never happend accidentaly.
or you could inform the proper authorities to fix it.
I'm not scripter but I think that's impossible to fix, because the marker detects when you are on foot, and if you "Accidentally" put a bike or a car in the marker, there are 2 entitys, 1 of you, and another for the car/bike, when you run over the marker and drive the bike, the car is no more an entity, so it will be teleported too. You get teleported to the bank on foot, but when the game phisycs detect you ride the bike, teleports the entity again to the same spot where the bike was... That "bug" it's how it works in VC Single Player too... it's not a bug I guess. Correct me if I'm wrong.