Tech prerequisite issues

Space probe rocket silo is only dependant on Astro 2 and Energy 2. Yet building the silo takes heavy girders, building the probe takes iridium. Meaning, it should also depend on heavy girders. Dunno if researching it should require material 1 due to that, but at least the requirement should be there as it's impossible to utilize unless that's researched.

Another is Material 4. First, it contains Particle beam shielding data, which has Space platform plating as one of the items, but is not dependant on it. This is probably more minor due to the fact that you'll probably research it anyway during material 1.
Also in Material 4 is Experimental alloys data, requiring Beryllium, Holmium and Iridium plates. Iridium is natural for Material science, Holmium is a dependency due to the tech requiring Particle Collider which comes from Energy science, but there's no dependency on Beryllium at all. So it's possible, although unlikely, to get to this point without knowing how to make beryllium plates.