This isn’t an Xbox issue.
A quick forum search will show you these issues with photogrammetry have been around since launch. You can have an excellent experience, then suddenly out of nowhere, your PG landscapes look like a melted post-apocalyptic wasteland. You get one group of users who say everything is fine and post screen shots to back up their view. And then you get others flying over the same areas showing screen shots of the horrible PG. Then as inexplicably as it started, everything goes back to normal again for the affected users.
I’ve experienced it multiple times in the past, but now it seems to work fine for me. I think it’s a server side issue.