Ok, I'm sure this has happened to a bunch of people. You're working on something on blockland and you notice you build something wrong. You try to hammer it but a bunch of bricks are on top so you take out your wand and hit it. You then notice some bricks you didn't want to destroy came down like detailed bricks or bricks with events that were complicated. Your first thought is to hit Ctrl Z but then you realize it doesn't do anything.
What I'm trying to get is, if you hit ctrl z and you wanded something before, it would reload the bricks.