I’m now having this problem too. However; my situation is a little different. I can still bump into the invisible chest but it won’t let me get into it to see the contents. This has happened to me 3 or 4 times today. Sucks losing out on the loot, but I at least still got the XP for it.
Any suggestions? like I said, I can hit where the box is supposed to be, it’s there but invisible, but can’t open it.