When shooting out of certain windows, there seems to be no bullet calculation at all. This can be seen by the missing bullet impacts outside the building. Also, when setting up a target directly behind the window, no hit is possible.
In addition, the "window" never breaks and provides this behaviour all the time.
Can confirm that. But did you tried different distance from the window, like does it work in the same way if you are 1-2 meteres away from it or as close to it as possible?
Tried not deliberately, but it also occured with different distances... including shooting INTO house through windows, which I used various distances for.