When you open up a container (such as a barrel) and then open up your equipped items (E button), and move items from "yourself" directly into container, they don't disappear from in-game screen.
i.e. if you see a sword in you hand, then move to the barrel and put it into there, you will still have that sword visible in hand.
[bug report] - item removal
[bug report] - item removal
Incinerator Fuel = Pure Ownage xD