Duplicates in loot box don't show under item

When opening a loot box, that contains duplicates, the +5c duplicates under the new item is not showing up. It shows the animation of duplicate when first opening box, but not afterwards.

I’ve had the same issue for several months, and was hoping it would get cleared up.

I opened a loot box on the PTR today, and it displays normally there. When I came back to Americas, the “duplicate” signage is still a black box.

Any luck? Does it still do it for you?