Hello! I get the following error when loading Factorio with K2SO and this mod (well technically the core Scrap Toolkit mod) enabled:
Failed to load mods: Error while loading recipe prototype "uranium-rounds-magazine" (recipe): Recipe has invalid main product uranium-rounds-magazine. The product does not exist in the recipe product list.
Modifications: Base mod › Krastorio 2 Spaced Out › Scrap Toolkit › Krastorio 2 Spaced Out
K2SO "deletes" the Uranium Rounds item and recipe, among others, through attempting to replace it with "kr-uranium-rifle-magazine" where possible in recipes, hiding it in the Factoriopedia, and removing it as an unlock.
I'm not entirely sure which exact line of K2SO's code is responsible for modifying the recipe in such a way that it clashes with Scrappy Industry, but it might be worth adding in some checks at some point to skip modifying item recipes if they're already modified in an incompatible way?
(The error mod trace does seem to suggest that Scrappy Industry somehow "reinserts" the uranium magazine back into the recipe list and then K2SO errors upon reading it, but I wouldn't really know, I'm not a Factorio modder)
All the best!