Item Duplication Glitch using Shulker Boxes

We found out an item duplication glitch using shulker boxes.

it requires 2 people for it work : one person continuously breaks the shulker box while the other person quickly tries to take out an item.
it requires for it to be perfectly timed for it to work, the person who tries to take out the item gets one in his inventory and as well as in the shulker box.

it also requires a haste 2 beacon and a efficiency 5 pickaxe for it to efficiently work.

this duplication glitch works for stackable items and un-stackable items 

Credits : BlurryMeal and ArchiveData