Crushing Industry adds sand to the recipe for Holmium Fluid and Electrolyte, making it a required item on Fulgora.
https://mods.factorio.com/mod/crushing-industry

Cerys adds a Ambient Radiation <= 200Bq requirement to the Crushing Industry Sand recipe.

Planetary Conditions makes it impossible to craft Sand on Fulgora with Crushing Industries installed which locks up the whole Holmium crafting chain.

This mod is an interesting idea and I'd like to see more recipes explore different conditions but for now I'll need to remove this mod. I'm not sure how you'd fix this, without just removing the radiation value from Fulgora, but it may be worth marking Crushing Industry as incompatible so no one gets stuck or confused when their crushers start refusing to take stone.

Thank you for your time.

Nevermind, Crushing Industry removed the Cerys limitation for crushing stone into sand an hour ago in 0.4.8.
https://mods.factorio.com/mod/crushing-industry/changelog

Got lucky with the update! I could've tweaked Fulgora's radiation to accommodate for that, would've been a simple fix. Perhaps I could look into making in-game settings to change every planet's ambient radiation value in the future, just in case anything like this ever comes up again.