More Detail Of Villager Trading Glitch

This is a glitch for all kinds of villagers that can trade. I choose this trade for an example. 10 emeralds for 1 diamond pickaxe. And this trade can use 7 times. Start of with 2 stacks of emerald, shift-click the sell with 1 stack of emerald and I got 6 diamond pickaxes. I have 1 stack and 4 emeralds left. So I repeat the same process once again and I got 6 more diamond pickaxes. Then I press E to exit the trading GUI and I got 54 emeralds back. But 4 of my pickaxe act like a fake item and disappeared when I click any item in my inventory.

Explanation:
Actually, this is a duplication glitch. I take the example above and explain how it works. A little bit of minecraft science occurred. You can't trade with villager when it reaches the max use of it. Then it will generate a new trade and close the old trade. But you can duplicate 1 more item from the sell by using this method. So 10 emeralds for 1 diamond pickaxe. And the max use of the villager is 7. Since I have two stacks of emerald, I can trade 7 diamond pickaxe. So I got 6 diamond pickaxe and 4 emeralds left. Then I put the next stack on it and shift-click the sell once. If you don't shift-click it, this glitch won't work. Now you have 12 diamond pickaxes in your inventory and 4 emeralds left from this trade. Then you need to press E to exit the trading menu and it should give you back 54 emeralds. Then open your inventory and click any of the items once, 4 of your pickaxes should be disappear. Now you need to do some calculation. Then max use of the villager is 7 and 10 emeralds for 1 diamond pickaxe. You use 60 emeralds in the first trade and 10 emeralds in the second trade. Then you got 8 diamond pickaxes from this two trade. The result is you got 1 more diamond pickaxe! You got 8 diamond pickaxes instead of 7 diamond pickaxes as normal.

This glitch will always work when the number of buy is less than max use(e.g. 1 emerald for 4 redstone and the max use is 7). Always shift-click the sell and press E to exit the trading menu and you got 1 more sell for free.