Looks like you trust the client on their window.ig.game.O722.rank, which allows people to remove blocks at the center and trap people. Check area 2, I think.
You are right, sorry for that and thanks for the reminder. We just recently changed that conceptually and haven't fully synced it -- for the first year, everyone at any rank was able to edit anywhere in area 1 - 4, even in center. We'll look at it soon, was quite a big wave tonight!