After putting items in a shulker box and breaking the box, the box has a chance to duplicate itself

Shulker boxes can duplicate themselves after being broken. To reproduce, put any item in an empty shulker box, then repetitively break the box. Eventually, the box will duplicate itself when dropped, with the duplicated box containing the exact materials that the recently mined shulker box contained. (which means with enough patience, you can collect infinite items)