Told my hearthlings to remove some overstanding blocks, so I have a clean wall. In this case, they removed the lower blocks first, then I build them a latter and they just removed the first 2 blocks. Guess the AI needs some tweeks here 
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Yeah currently they don’t like mining up. down they do like, so the most effective way of mining currently is ladder up, 4 high strip (as wide and deep as you wany) and then mine from there.