Correct me if I’m wrong, but I think the scenery loads in chunks. They aren’t gonna be perfect where they intersect. That’s why you can see lines if you look closely. You can’t really see it if you’re under 10,000ft in my experience.
Yes, it loads like that, but from my recent experiences, even if I zoom, there are some parts that still look a bit darker, it’s weird because that had never happened before, probably it’s a 21.1 issue. Fortunately it doesn’t happen in all my flights