Red sand does not generate inside water on badlands biomes and will mostly generate with stone instead. This does not happens with yellow sand on regular deserts.

Steps to Reproduce:
1. Create a world
2. Locate or seach a mesa biome
3. Search for water

Observed Results:
No red sand generate underwater, no matter the amount of water.

Expected Results:
Red sand generates underwater just like regular sand generates on deserts.