Alright, I created this account just to post about this, because I am also getting the blue planet bug. Rather, every planet with an atmosphere becomes opaque.
That's not the only problem I am having, though. Whenever I cross the 140000m mark, all planet textures will become black, even if the craft is on the light side of the planet. Also, I have discovered that if you open the Scatterer menu and press the AtmosphereGlobalScale "Set" button, the textures will return to the map, as shown in these two videos.
Also, I'm not really sure if one thing is related to the other, but my game seems really dark. What to do to get it brighter?
Hopefully this helps you solve the problem, @Phineas Freak .
https://my.mixtape.moe/bljzse.webm
https://my.mixtape.moe/btdpfh.webm