RiverCanyon2 (VINV)

Players can fall through this map in several spots and survive, shooting at monsters with impunity and not being flagged out of bounds. Monsters can fall through too, and players can't hit them.

I can corroborate this. Ghosted under the map, where I could shoot at enemys, didn't get counted out. Had to suicide to ghost back. Also, I frequently saw Awareness health bars randomly around the map with no monster associated with them. I assume this was from monsters that had also fallen under the map.