MC-127415Item Frame Duplication
As shown in the video below, someone has found a way to duplicate items in Vanilla versions of Minecraft using an item frame and a piston. When breaking an item frame with a piston, you are able to hit the item frame with your fist at roughly the same time, resulting in two of the same item being duplicated. This can be done with any item, including shulker boxes with items inside of them.
