I was trying to make Earth around a binary star system , by having a small star orbit within a larger ones habitable zone, then having Earth orbit within the smaller star's zone.
However, as it orbited I noticed it's atmosphere only showed on the side facing its parent star, while the other side was lit, but no atmosphere shown.
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So I did a test, and placed several planets (Earth) into the habitable zone of different stars, with a lot more in the simulation, and they all pointed to a 4.07 solar mass white star several light years away.
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I'm not a coder by any means, but I think it may be related to brightness or mass, as every planet's atmosphere pointed to that particular one, even with other closer stars in the simulation.