Invisible Rooms on surf_utopia

[kung foo man]

Hey, Utopia is a giant map with many teleport-triggers and the problem is now, that the teleport-rooms are not visible.

I guess cod2map.exe is removing them, because they are not connected to the "main-world" with spawns.

Does anybody know how to compile the map without deleting the view-geometry of this room? I can walk in there, but it looks just like nodraw.