BIS, have a nice day.
Any corpses, and sometimes the other objects (static weapons, fortifications, furniture) which were placed on the second floor with the help of an Eden Editor (above the ground floor), after the destruction of this building, will remain hanging in the void. Or any soldier who was killed on the second floor of the building will remain there forever as a levitating corpse
BIS Please correct this in the most convenient way for you.
As seems to me, does not need to create for this purpose super physics of falling for all objects which inside! After building collapse, just make them disappear. It will look, like it was buried under the ruins.