Just played a game with a planet inside it.... 2 planets same orbit.... You could still land on it, by going into orbit clicking on it and zooming in through the outer planet. Amusing that no one noticed.. but yes this is a thing... Just a heads up..
Actually it's well known thing. At moment there is no collision detection for planets so it's usually happen.
*hey, where's that green guy gone?* *oh, I saw him leave planet a while ago. Looked like he just went to the Sun and came back - weirdest thing I've seen* *huh. Weird.* Collision detection? God - that would ruin 50% of all moon systems we have now Only 10 minutes in, half the moons would be crushed and falling out of orbit. It would be a space race to the nearest safe rock
The bug is caused by old systems being loaded into the game that were set a orbiting distances greater or less than the new restriction from the new patch. If they were saved and were not within the restrictions they were moved to within these perimeters. If multiple bodies were outside this, then they are both moved within and then overlapped sine they were then the same orbit and overlap.