Chain reaction for each voxel. That's actually smart. Was a bit buggy for me, builder guy didn't do much, then randomly started building and during that the game crashed. Ofc I set the crops on fire and everything else and that was funny hell ye. P good :D
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Interesting that there was a crash -- the builder does a pre-scan check to clear every single block in the space he's about to build, so that's why he "didn't do anything" then appeared to randomly start. It's a bit more obvious if you don't place in a field that he's scanning and breaking. He starts from the sky first and then to the ground. One thing I could do is that he skips smartly on blocks in the sky when breaking.