Hello!
It's been a while since OGF got better by removing histor and topo layers, but also coastlines stopped re-rendering at zooms 9 and lower. This can be a bit annoying, with best example being islands in Plevia:
https://opengeofiction.net/#map=9/44.7370/63.5641
and Ginnungaoyar:
https://opengeofiction.net/#map=9/-58.0808/84.8831
I think that re-rendering all coastlines once for about two weeks would be a reasonable solution.
MiePrzKom