Beerrun exploiting?

I was spec. on beerun since the game only had a couple of minutes left when I got on.  I did notice that in the last room where the trucks are an axis player was on the roof via the opening in the ceiling.  The problem with this is the axis player could see the allied through the ceiling long before the allied could see the axis.  It's like a one way mirror.  The allied can't see through the roof.  This may be considered playing off map?  Should this be an off limits area?

Can the bots see you?

You can see through the floor the allied as he comes down the hallway and enters the room but he can't see you.  Like a one way mirror.