My husband and I have a shared hosted save for our Xbox Series X that has worked fine for both of us all week, taking turns hosting depending on who was off work first, but suddenly today it would not load for him. When he tried Hosting > Continue the save, it crashed the whole game and returned him to the Xbox home page. It loaded fine for me when I tried hosting it; he could join me, but when I stopped hosting and he tried again, it failed. We tried all sorts of things from his Xbox - deleting the saves, deleting and reloading the game, letting it resync the cloud data, but nothing was working. However, I noticed that he had Auto Saves set to 5, where mine was set to 3. So, I had him change the Options > Auto Save > Auto Save = 0 from the main menu before loading the game, and the game loaded just fine. Once he was in, he changed the Auto Saves back to 3. He's off adventuring again, while I have to go back to work lol.

We wanted to share this in case anyone else has this issue. I don't know if it's a conflict between who hosted last and the number of auto saves, but setting it to 0 and then relaunching seems to have fixed his issue. 

I had to restart the xbox it should work then