Wooded badlands biome generates as regular badlands below y=100

Wooded badlands don't generate their distinctive terrain below height level y=100, causing inconsistencies due to how this biome no longer generates on plateaus anymore.

There are instances where you would find this biome only below y=100, and it wouldn't generate any grass, coarse dirt or trees. Which might be confusing and misleading.

Expected result

Wooded badlands would generate trees, coarse dirt, and grass below y=100.

Observed result

Wooded badlands generates as regular badlands instead.

How to reproduce

1. Create a single biome world of wooded badlands.
2. See the terrain around.