Creeps walking through Room Protection walls
After the most recent patch, creeps were able to walk straight through Room Protection walls and invade room W48S46 while it was still "protected". You can see this in the room history starting on tick # 12202382.
I suspect this may be related to the "exit tiles don't cost fatigue" change?
This bug has been in effect for a few hours after the patch and is already fixed. Sorry for that.