Wait- I just tried setting up a bunch of the hard snowy islands and then deleting them to see if the glitch would come back on any of them, but it didn't. The hard snowy island was the first island I went to in the pre release update, so I was kind of in shock of all the new things, meaning, when I looked at the new mutation menu and all of it's glory, I wasn't really paying attention to the snowy genes. I thought that I saw them out of the corner of my eye, but I might have been mistaken. It wasn't until 2 Seri! Pixel Biologist! episodes later that I realized I should report what I thought I saw. I'm so sorry for wasting your time!