A severe bug

When the player's backpack is full and there are extra fallen objects on the ground, open the Grindstone ‘s GUI, then press and hold the shift key to put the items that need to be dis-enchanted into the game, and continue to press and hold the shift key. Take out the synthetic items, the synthetic items will fall out of the backpack directly, and the synthetic items will not disappear, and this loophole is repeated infinitely and gain a lot of experience.
With this bug, no matter what GUI (anvil, crafting table, grindstone) is used to synthesize things, things will fall out of the backpack. In addition, after this bug is triggered. The backpack does not need to be full.（Just like the videos.）