An issue was found in the surface material: attenuation was calculated incorrectly for the planet surface. An update was released to address this issue. The updated version is recommended for use with new projects. However, if you have applied the update to an existing project you may have noticed that your planets now look differently.
If you have noticed any unwanted changes after applying the update to an existing project, please download this downgrade patch and unpack it into your project folder. This will switch the project back to old attenuation algorithm.