After switching to a skin using the !skins (Skins Factored) changer with any skin, like Gear Girl 2.0 You lose the ability to handcraft Nauvis science packs.
You can find the save with Nuclear Science, and some !skins skins enabled with the material required to handcraft science I used for testing here
Its an issue with the character being swapped, not gonna act like I'm an expert here but when you aren't switched you're fine, but most of the other recipes still work, so I'd have to assume this is some error. Im just posting this to Nuclear Science because I've rarely seen this happen before, only once with Military Crafting on Castra so they're dealing with the same thing too, but I don't think the error is on !skins' end because I don't see it pop up often. (to my extremely limited knowledge)
