NEW DUPLICATION GLITCH 1.2.13.5

Ok, no one saw my report so I'm gonna report it again (please tell me if this isn't allowed).

The new Classic UI for touch devices brought a new duplication glitch. I'm not 100% sure about how it works, but I smelt a full stack of iron. My inventory was full, and I already had one ingot in my inventory. When I moved the stack to the ingot slot, it duplicated. Both my slot AND the furnace had the stack.

Here's another situation:

Later, I smelt 10 ores with the inventory full, and I already had 56 iron ingots in my inventory. It didn't duplicate, but I was able to make infinite XP.

I use a Samsung Galaxy J5 2016

Sorry if I mispelled something, I'm trying my best to speak english correctly...
(Some players will be mad at me for reporting this glitch, but... I don't care :v)