I have this same issue and I'm on xbox one. I have this problem with 3 other treasure hoards as well. As for asking for a video to show that this is happening....if everyone else has as many bugs as I am and I'm sure I'm not special in that, I think that's asking to much. My settlement can't be decorated since the ostara festival, my lieutenants armor and weapons return to default anytime I leave the settlement. Not to mention the massive amount of lost gameplay due to the corrupt file error that was manual and auto saves. I'm happy to help but multiple posts and videos is asking a lot of people who preordered your game and probably paid for a version with "extras." That's my opinion

I've also had the data corrupt error a lot if your not paying attention. Both manual and auto saves. Easily lost over 50 hours of gameplay. This was on xbox one the digital version.

I have multiple treasure hoards unable to be completed. Suthsexe, Oxenefordscire, Eurvicscire....I was able to interact with these 3 but nothing happened. I received no rewards and the maps are still in my inventory. Hamtunscire had nothing for me to interact with at all. So that makes 100% unobtainable for me. Frustrating when you preordered the ultimate edition.