I don't have a screenshot, but I was playing the other day and two of my double chests turned partly invisible, (the right side was invisible, but the outline of where the chest should be was there), and when I tried to right click on the invisible part of the chest, it crashed my game, and when I started it back up the whole chest was visible, and so I repeated it on the other double chest with the same result, although I could use the non invisible part of the chest normally.