i've found a bug that can be too easily misused, version 6.1.1 for minecraft 1.8 , i had the efficiency XXL "Ore Placer" diamond pickaxe, and when using it on a lucky block, not only do i get the drop but i also get the lucky block back 100% of the time, i don't think that's supposed to happen... of course it's not too big of a deal, except for mini games, it can be abused, or if they dont know its the pick and just think they get more...