[Experimental] Caves No Longer Generate In Nether

Summary: Caves Aren't In Nether.

Steps To Reproduce:
Step 1: Go To Nether in 1.17.30.23 with Caves N Cliffs Enabled.
Step 2: Fly Around.
Step 3: Repeat.

Observed Result: No Caves in Nether.

Expected Result: Caves In Nether.