In the BlockBreakEvent class, the method isDropItem() always return true

The method isDropItem() of the class BlockBreakEvent should gets whether or not the block will drop items, but always return true regardless of the resultat (e.g mining diamand_ore with a wooden_axe, aka the wrong tool,  dont drop item at all, but isDropItem() return true).

encs : a  minimal reproduction plugin that show "The block drop a item" when isDropItem() is true and "The block dont drop a item" when isDropItem() is false, and the classes i make it.