Hi

I stumbled upon this problem they had with some Cerys recipes: https://mods.factorio.com/mod/atan-nuclear-science/discussion/67ae37f1f211702eac90a17a, I commented there.

It boils down to when you replace concrete with concrete mix in certain recipes, Nuclear Science's atom forge cannot craft the nuclear science pack since the atom forge hasn't got valid fluid connectors.

The workaround is also linked in the thread above, I commented there, too: https://mods.factorio.com/mod/cerys-and-nuclear-science/discussion/68067f744bc9b3182ef3819a

I don't think this a problem you should solve, maybe you could refrain from exchanging concrete with concrete mix when the recipe can be crafted by machines which don't have fluid input - but I think it would be way more sensible if Nuclear Science's atom forge would accept fluids. On the other hand, that's their decision, so I'm not sure if you want to do something about this constellation.

It all works with the fix mod, just thought I'd let you know.

Hiya! Yeah I actually plan on fixing this in a future CI update, it will take a bit since I have higher priorities unfortunately, but I'll make it so the replacement respects the fewest amount of fluids usable in the set of machines that can craft a recipe

And this will be done procedurally, so that the fix mod you linked should re-enable the recipe to use concrete mix instead