What about the situation where the "selection" shifts as you click to place .. causing it to place a block not where intended?
And to be clear, I am not talking about where the mouse was moved last moment and you misplace. Rather about where the game seems to "jitter" and place where it shouldn't be. This even can (infrequently, but I run across it now and then) place a block BEHIND another block, where you have no visual line of sight to the "back" of the block where it's placing it. Ie, there's no way you could do it on purpose, as you can't target the far side of a block that's out of visual view, but the game "jitter" (for want of better term) still targets it, and places it in an impossible location.