I was clearing the immortal summit, and in one of the halls connecting an area my loot clumped up against a wall, and somehow and Uni item that dropped had no item name, only a border about this large with no content, and you could see the item tooltip on hover, but could not loot the item. I only noticed the drop because I had my map up, or I’d have run by it without looting, Hiding and displaying the loot fixed the issue with looting, but I am unsure how common this bug is.
Snowblind helm was the specific item.