Didn't show up? That suggests you visited the planet not because BioInsight directed you to it, but because the scan showed there was a Bio feature -- is that right?
Is that intended, or is it a bug?
I'm trying to get my head around BioInsight SOP. If it doesn't show all bio signals discovered, even if a prediction about what is there cannot be made, the player must double check the results of the DSS scan against BioInsight output to identify any discrepancies, and then also go for those to verify what is there.
BioInsights should (unless disabled) notify you of any atmospheric landable with life - so it's giving a heads-up to check. There are instances where it doesn't predict bios that are present - in 99% of those cases, it's older Horizons bios that it doesn't (yet) support. If it can't predict anything for a body, it doesn't add it to the UI - this is on my list to improve but I've been waiting on the Core UI rewrite before I do too much with the existing UI.