The remote planet graphics disappears, when scrolling up too far, and then pausing the game.
In general the planet "jumps" when doing so. I assume it has something to do with the parallax effect, maybe.
1) Reveal the surface of the asteroid.
2) Pause / unpause the game while being scrolled up quite far (see screenshots for reference).
3) The planet will dissappear.
(The "scrolling threshold" in this case was having the top end of the map at "coal" vs "polluted dirt")