Visible tile borders with SimpleSky enabled

Hello!

Since osgEarth 3.1 there is strange effect with sunlit tiles, is there way to make it like it was before (smooth transition, no visible borders between tiles)?

Here is how it's looks like for me with osgearth_viewer and nodata.earth with --sky option:


osgEarth 3.1 + osg 3.6.5