I was having an issue with the cairn missions where I would not see an option to interact with them. The first time I saw this (NW section of map, maybe Eurovicsire), I thought it might be part of another mission, so I moved on. I saw it happen again in Snotinghamscire, and again in the mystery Stoneman. I decided to save my game and reboot. I created two saves, quit Valhalla, and restarted my xbox series x. I started the game back up to see that I've lost 10 hours of gameplay. My two saves were gone, and everything reverted back to a save from 1/15/2021.
I had completely cleared out all the wealth, mysteries, and artifacts in Lincolnscire, Jorvik, Eurvicscire (except for the one Cairn), and made solid progress on Snotinghamscire and now it looks like I haven't even entered those territories.