Only had this happen once, so far.
Playing as Phoenix I come across a team mate that needs reviving, the only issue is that he’s inside/under the car 
I did circle the car, to make sure it wasn’t a case of coinciding to line up with the car (I wish I’d remember to record a video). It might be something specific to that car object (I think it’s the blue one that can explode) and not the map (London Bridge).
Theory: Could it be that if a player get’s incapacitated while on top of the car (the one that can explode) he goes right through it until it hits the ground?
Bad screenshot because I’d been hit with a concussion grenade.
Here are 2 screenshots to better identify the car’s location:
