Soul fire does not generate in the nether wastes biome on top of soul sand.

Steps to Reproduce:

1. Create a world, and go to the nether wastes:

   /locate biome minecraft:nether_wastes
   

2. Fly around and try to find soul fire inside the biome

Expected Result:

You would find soul fire, because it is included inside the possible features which can generate in a nether waste biome:

Observed Behavior:

You will never find soul fire in the nether wastes, despite there being soul sand patches around.

Screenshots/Videos:

The cause of the issue, where the feature only generates on soul soil:

Notes:

1. This issue was first reported with reproducing the issue in a buffet world, but these kinds of worlds are no longer possible to make.