Resolution: Works As Intended
Affects Version/s: Minecraft 1.9.4, Minecraft 1.10
Fix Version/s: None
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.