I don't have screenshots but I do have a story.
I'm trading with my friend OnyxGem, they hvae some coal i would like, and I will be giving cloth in exchange. However, we had an instance of disapperaing objects.
They put their coal up, a smart stack, 99, and 98, of soft coal. I accidentally pressed Esc, exiting the trade. neither of us had the coal, it had disappeared. I wanted to see if things disappeared like that in an experiment. We started a new trade, i put 102 red cloth, smart stacked, 99 and 3, into the trade, and then OnyxGem exited the trade.
this made my 102 cloth disappear. Neither of us had it, not in our inventories, and we checked to see if opening the trade menu fixed it or not. It did not.
both of us exited the game, Esc, quit game. then we restarted. (thank goodness for fast load times) and THEN, both of us had our items back in our inventories. so we traded successfully, 102 cloth for the 197 coal. worked fine, nothing wrong.
We wanted to bring attention to the fact that this happens, and probably should be fixed sometime. But, good to know the item isnt removed, it just disappears and you cant see it.