Item duplication glitch

There's a duplication glitch where you can duplicate every single item/s in the game. If you have 64 diamond then you'll get 2 stacks of diamonds after the duplication process.

 

I'm not completely sure how to do the glitch but you need a piston and a chest where you put the selected item/s. Then you'll activate the piston and try to grab the item/s when the piston is activated. Sometimes the item/s will appear in your inventory and still will exist in the chest. Now you have the double of the chosen item/s as before... 

There's a lot of video tutorials on YouTube you can what's to see what I'm talking about !

I find it frustrating and boring when people duplicate diamonds and other items on my realm. All the grinding I've done on the world is worthless now and I can't ban them all because then no one will play because everyone duplicates...