There was a longsword on the ground that was just dropped by a fallen hero. I wanted to pick it up. I did not have space in the bag so I tried to drop a shield from the bag first. I used the drag-and-drop command with the mouse on top of the longsword. The longsword disappeared and only the shield was standing on the ground.
My expectation was that the longsword would remain on the ground.
I am using mods, but who doesn’t? Log is attached. I have a save before the battle if you want it.