I have the extra bar space, but no flasks show.

Currently in a new world, doing Automation research. It doesn't show red flasks.

I am using a few mods. Can provide a save if you need it.

a save would be nice

After some time, it has fixed itself. And I don't have an autosave anymore. It started working a while ago and I only just noticed. Sorry about that.

I think it doesn't work if you only have red science unlocked.

there is also a check in there if just 1 lab lacks them it gets ignored, but i'm gonna rewrite this for 2.0 anyways since i wasn't happy with the detection system to begin with, its currently just a port of how it behaved in 1.x

Fair enough. Sorry that my bug report ended up being a nothingburger. I will upload a save if the issue starts happening again.

Another minor bug: The icons still show above other windows. Which looks particularly bad on the map view. You should check to make sure nothing is open before drawing them.

yeah that bug exists to fix another bug