Duplicate/Glitch

duplicate anything and exit the game and go back in
i drop something, exit, then go back in and if you do it at the right time you will have 2 of the same item.

Steps to Reproduce:
1. drop something
2. when the item is shown in your hot bar and the item still on the ground and your hand isn't holding anything quickly press escape.(when in main hand)
3. then press save and exit.
4. go back in and if you did it right then you should have to of that item.
5. you can have as much items as you want to do it with and it will still work.

p.s. this works for any game mode