Exactly when are the Void Flux & Coherence Infusion recipes created? I know they are made dynamically, I'm just not sure about when they are actually created.

It is annoying to not be able to use the Void Flux or Coherence recipe in Factory Planner without researching the object in question first.
It seems like those variants straight-up do not exist until the tech is researched, instead of being unlocked.

Might also help with the Castra Issue mentioned previously, where base military ammunition is available with the basic summon, but doesn't have a void flux or coherence infusion variant (Beside the landmine for some reason), and where red & green ammo summoning is restricted to the Castra Forges.

They are created at the end of data.lua. Other mods that provide Voidcraft recipes (e.g., Planetary Compatibility ) do the same in their own code. They are unlocked via code in control.lua because there's not really another option, but the fact that the recipes aren't part of the normal tech tree is probably why Factory Planner can't see them.

Castra's problem is different: it just grabs every ammo recipe and indiscriminately changes the crafting category and there's no way to tell it not to. If there were some sort of castra_ignore property I could set on the recipe then I could fix it, but the developer of Castra would have to add that.