Biome page not working

[eehunter]

mystcraft-1.12.2-0.13.7.04 Biome pages don't seem to be working in my world. I made an age with the following immediately after the link panel: Ice Plains Biome, Single Biome Distribution, Packed Ice Block, Water Block, Cave World, Clear Modifiers... This resulted in an entirely Plains world, with some random bits of Glacier from Ice and Fire.

[XCompWiz]

That's odd. Can you reproduce this with just Mystcraft?