I have planet rotation disabled, but a recent update is now causing them to rotate again, but only when out of view. Whenever i look at any of my platforms, the planet in the background appears static, but going back and forth between platforms will update the rotation ever so slightly. This is particularly noticeable with Neumann V in the "Metal and Stars" system. To be honest, i'm not a fan of the planet rotation feature and prefer them to remain static, especially since it occasionally obscurs the moons behind the platforms.