With recent update (probably 3.0.8 or somewhere), I noticed if the range ring have one over 4000NM, all range ring from this center would not show.

If I move the view, it might show in some very specific angle/zoom, but not always able to find that

I normally use 120 420 1000 1600 4000 4800, now 120 420 1000 1600 3999 can reliably show up, but even a single 4000 could not. And same for both projection.

4800 show in Spherical projection here.

They are missing in Mercator and also disappear on certain zoom levels in the spherical which are both bugs. I'll fix this for the next release.

Alex