Done Ressurection: Bug with Advanced Diamond Drill

I have noticed that if i break an enderchest while in big holes mode (Digs a 3*3 of terrain) on the advanced diamond drill it will destroy the enderchest. Upon further testing it appears that big holes is the only mode that destroys the block. Al other modes drop the item like it would if you broke it with a pickaxe. just thought i would report this as it is unusual.
sincerely,
Metalobism (Owner of Metalocorp)