I have noticed that rare items objects are showing up on maps, including some with zero probability, like the Precursor Shielded world. I've added both star systems and planets by mod, so this is a mod problem, not a vanilla-game issue. Here are the options as I see them:
1) The probabilities don't work right.
2) I'm using them wrong. Do they have to add up to 100? I thought they were relative probabilities... if they have to add up to 100 that really limits options a lot!
Anyone know what is going on? Did I miss something?