I wish that were the problem.
I'm not sure what's going on here now, tbh. The version I have on my PC is 1.11, and I ran it through diffchecker with the version up for download and they're exactly the same except my version has notes in the patchnotes section that says it fixed an issue with that function. The actual function is exactly the same in both versions though.
It's like I'd started to fix a problem with that function, and wrote the patch notes first (which I honestly never do), and then... stopped making the fix and forgot about it? I don't know what crash problem I allegedly fixed with the function if the function is exactly the same between versions, either.
In any case, your load order is correct. It works for me in a completely clean test project, and my own test project. The only thing I could think of that might be causing problems if if you changed the experience curve, and the changeCraftExperience function can't get a usable value out of it to check against, but if that were the case, none of your crafts would ever level up, not just this one you're gaining experience with using the function. And also if that were the case, I think it'd probably cause a crash rather than just not work, since I used 'eval' instead of 'try', if there was some unforeseen problem with the formula the function would end up comparing a number to NaN, and not like that.