can't disable func_respawnroom

[joshtrademark]

i am trying to make a forward spawn that turns a room into a respawn room, everything about it works except for the fact that even though "start disabled" is set to yes on the func_respawnroom, you can still go into that room and change class. i've tried using a logic entity to disable it when the map starts, but it's still enabled. is it not disable-able or am i doing something wrong?