I started organizing the tiles into tilesets to help keep track of "missing" tiles (like how snow-mountains (not snowpeaks) have noticeable fewer connecting/partial tiles and such) and I can confirm that it's not just a skipped number:
I mean, I'll just copy-paste my own tile together from the others, it's not a huge deal, I felt I should tell you.
Edit: Btw, what do I win for finding the hidden hamsters?