I've just encountered this issue myself. It is really annoying, I've encountered it on my other game but only once. it's even more annoying because I tried ignoring it and I just ended up losing like 20hours of gamplay instead on my world. And I've tried to factory reset my xbox already too but it did nothing. I too think it's a xbox problem but I've tried to delete all my game clips too but that didn't work either. I have no idea what it is but I really hope mircrosoft fixes it. Because the fact I still encounter it months after it first came up is crazy.
I forgot to mention that on my other game it fixed once I deleted my game clips. at least for now I'll update in the future