Duplication glitch

Duplication glitches, commonly known as dupes, are glitches or bugs in the game or 2b2t itself that allows a player the ability to duplicate an item. There have been several duplication glitches throughout the history of 2b2t, most prominently involving shulker boxes, as they can hold great amounts of items being duplicated. While this is technically illegal on the server due to the rule against game-breaking exploits, Hausemaster, the main server operator, allows the players to keep the duplicated items and doesn't hurry when it comes to patching them (save for the 1.12 Crafting Dupe which destroyed the economy in mutes, which was resolved within hours). Duped items tend to be stored in dupe stashes, usually small bases filled with several rows of chests which can be found scattered throughout the server.

Publicly known duplication glitches
Note: All minecart and donkey duplication glitches (which are all patched) mentioned here are all different versions of each other with slight differences in their usage. It should also be noted that there have been several dupe glitches that have been kept secret and otherwise unknown by the general public, meaning this list does not contain every dupe glitch.

Other lesser known/extra duplication glitches
The Ender Chest dupe was a public (yet) but still a bit secret dupe as people thought it was fake, It was active in 1.10, 1.10.2, 1.11, 1.11.2 and 1.12. Its now patched by either Hausemaster or PaperSpigot, it worked like this:
 * Open an ender chest, look at the GOLD plate on it
 * Drop an item while in the ender chest / or pick it up at the same tick you open it
 * Dropping the item while in the ender chest will eventually cause it to duplicate once.

'''AKA. SLOW DUPE. '''(It could take many hours to dupe the item just once)

The Zombie dupe might seem like the Donkey and Llama dupe from 1.11.2.

To do it: (maybe this isn't 100% accurate)
 * Make a Zombie (Regular) wear any type of armor and push it through an End Portal (might work with nether )
 * Make it a HALF HEART before you push it in, make it take damage at the EXACT same tick it goes through the portal.
 * If you are lucky, it will duplicate.