++Going into creative and grabbing any item then goin to your inventory by pressing the chest icon down at the bottom and the picking up the item and throwing out of your inventory by throwing it at the bottom of the screen will put the item in your first slot the repeat and it should appear in your second hotbar slot if you're using a shulker if not it should just double the item. Then close the inventory and if you're using a shulker press q (or your drop button) on your first hotbar slot and it should drop the shulker duplicating it. ONLY WORKS IN CREATIVE