I noticed that if you rapidly drag an item back and forth between 2 slots, the item will eventually 'duplicate' and be in both slots.
Of course, one of the items WILL disappear when you change map, so this is practically useless. But does anyone have any idea if quitting at the 'connected' mark on a separate client (like with the old duping) if there is any chance this would keep both of them? I somehow doubt it. But it's still interesting that you can temporarily dupe something at least XD Though if you did it to a pot i don't think that the pot would work.