The Xirmisala population collection law, "Dust Dowsing"—which reportedly provides +30% Dust on systems with a Unique Planet—has no effect.

In addition to the law's effect description reading, "LawEffectP00L26-PopulationCollectionMinorOracularEffectOverride" instead of an actual modifier (the +30% Dust on Unique Planet is information I found online while looking for a solution), the reported modifier of +30% doesn't take effect. Having this law active provides no bonus to a system's Dust income nor a unique planet's Dust output. As near as I can tell, the law does literally nothing.

In searching the XMLs for a way to fix the issue, I found that the "SimulationDescriptors[LawEffect_DLC4]" file has no actual law effect described in it. It seems to name the law effect, but then doesn't actually provide an effect. I don't know if this is the source of the issue, but I'm not very proficient in modding anyway, so I wasn't able to make it work with the few things I tried. All I can say for sure is, the Xirmisala law simply doesn't do anything.

The wiki is outdated, and you're wrong about it having no effect (though I can understand why it looks like it doesn't), the effect isn't simulation based. The problem here is that there is no correlating localization string / I forgot to put a % in front of it. The actual effect is that it reveals special dust curiosities that give a ton of dust.

Oooh, I see; thank you for clearing that up! I was under the mistaken impression that the Dust deposits were the old law, while the Dust bonus on unique planets was the new law...I'm a dumbass. :p In that case, it's just the label that's wrong, but I think that's a known issue. Is that what can be fixed with the %? Is that something simple that my dumb ass (possibly with the help of my hands) can fix with a quick and easy edit? EDIT: And I didn't test it over several turns, because I was expecting an instant change in Dust production on certain systems, so that's my bad, too. If I'd have run it a few turns, I might've seen it working!