What: With Vaulters Visuals and Celestial Vines affinity, "Unstable Isotope" does not provide the electromagnetic shielding defensive building. 


How: Vaulters Visuals, Celestial Vines, start game, look. 


Given that it's usually there, and the tech isn't listed as in any way faction specific, it is kind of odd that this tech in particular is missing part of the unlocks.

Though I can't shake the feeling it might have somehow been intended in some very weird way.