[PvK]

Last time I created a star in a system-wide nebula during play, was in a much older version of the game than the current one. But it was possible at one point. There's another obscure reason or two one might want to do so, besides building a ring/sphere-world.

Of course, it used to be possible to move planets, too, until that bug was fixed.

I hadn't heard of the "vanishing star bug" though - what's that? Try to make a ring/sphere-world in a system with many planets, and the star just vanishes with no planet created?

PvK