I'm not entirely sure if this is a bug in the game's code, or if it's specific to this seed, but there's an area of this world where the Mesa (Bryce) generates incorrectly with a wide 'V' cut into the hardened clay.

It doesn't go past the Bryce variant, & it doesn't affect any other types of biomes around it.

Seed: 7699872124672831217
X: -366
Y: 90
Z: -1381