Okay, I wasn't crazy. I realised about 1 second after I saw the icon which item it was, so I didn't manage to get a screenshot.
Lo and behold though, it was indeed the wrong icon that spins and flies into the bag.
It looks like a white "cloth shoulders" as it flies into your bags, looks like a gold trimmed white cape in your backpack.
I mean, it's really a non-issue that almost nobody will notice, but I noticed!
