Sometimes will mine blocks when touch point is on or very near to on-screen dpad

Sometimes when playing, your character does not move when you press the on-screen dpad. It looks like the game is trying to mine where your finger is touching. I'm not sure if this happens when you are actually touching one of the directions of the dpad or are just very close to it. The easiest way to fix this would be to not allow mining anywhere in the radius of the dpad arrows. Then all touches within this radius would be considered for movement.