Initially the polygon looks fine. When you change the zoom and tiles start changing, they seemingly arbitrarily start to cover up some of the polygon. Sorry I don't have a small reproducible example handy. I'll try to create one. <img width="785" height="571" alt="Image" src="https://github.com/user-attachments/assets/1750ff9a-7325-43e9-a5ea-f70341819281" />