Magic Keyboard + Windows 10 -- disable fn lock?
Solution 1:
So, I couldn't tell you why or how, but I downloaded this software:
https://magicutilities.net/download
After installing it, this "feature" went away and the fn key no longer caused other modifier keys to become sticky. Downside is there's a yearly fee for this software, so if anyone has any other ideas I'd love to hear them!