[BUG] Items in slots turning invisible.
Initially had an item in my last slot (?) and then I thought I'd lost it, but turns out it was just invisible. I could swap another item into that same slot and it immediately would also disappear. I kept playing and eventually it corrected itself, but then later the first item slot started to do the same thing.
Saving and exiting the game cleared the issue, so I don't have a screenshot or video of it at this time - will try to capture it next time.