Anvil and Grindstone Duplication Glitch

I found this glitch in tandem with another glitch that i cannot reproduce. The glitch i had before made me instantly drop any item i took out of a gui, anvil/grindstone, furnace, crafting table, etc output or input. When i had this glitch active on survival minecraft and took the output out of an anvil or grindstone, the item in the second slot of the gui would be consumed but not the one in the first. This meant that i could infinitely duplicate unenchanted items with durability infinitely and the current durability wouldn't change. The same thing happens with an anvil. This one isn't infinite since it requires xp and for you to rename and/or repair/combine the item to show an output. While I haven't tried it with enchanted items, I think it would still work. If it does, then it is not just an infinite item glitch, but an infinite xp glitch. This glitch has varying difficulty. If the first glitch is active, this is the easiest duplication glitch ever. If it isn't, then it is one of the most difficult since it seems that you need to drop the item and take it out simultaneously which I don't know if it is humanly possible to do. One way I managed to exploit it was to duplicate iron/gold tools infinitely along with wooden ones. I used the wooden ones for fuel to smelt the iron/gold into nuggets giving me infinite iron/gold. Not the best use but still crazy. I think this glitch is similar to the ones that trigger from picking up an item to fill up your last inventory slot and taking an item out of a grid at the same time but those work with crafting tables whereas this one doesn't. I think it works because the item never enters your inventory so the game thinks the output is still there.