Just to confirm your setup, you have a Mobility: Static Earth and a Mobility: Movable Earth and a Stationary Point Light. With that setup I am not having problems with the rendering. Are you sure that the movable one is the Earth that is disappearing and not the Static one?
Yes I am sure the movable earth is disappearing and the point light is set to stati. Also there is another directional light in the scene.
Also I want to add something more. I feel the actor just doesn’t exist in the screen. Cause I have ray tracing on the screen when I click mouse at any point. It detects if click on the actor or not. And I cant seem to click on it even if I click on the dark parts of the screen where it is supposed to be.
Took some time to find the bug… Not related to UE4. I had set something in the Tick which changed the object position. And I had not given it any default value.