Well, that works

code/controllers/subsystem/callback.dm

@@ -4,11 +4,11 @@ SUBSYSTEM_DEF(callbacks)
 	wait = 1
 	priority = FIRE_PRIORITY_CALLBACKS
 
-/proc/process_callbacks()
+/proc/process_atmos_callbacks()
 	SScallbacks.can_fire = 0
 	SScallbacks.flags |= SS_NO_FIRE
 	CRASH("Auxtools not found! Callback subsystem shutting itself off.")
 
 /datum/controller/subsystem/callbacks/fire()
-	if(process_callbacks(null,MC_TICK_REMAINING_MS))
+	if(process_atmos_callbacks(MC_TICK_REMAINING_MS))
 		pause()