The dripstone biome is is more rare than the lush caves

The dripstone biome is more rare compare to the lush caves

and i dont known if it is expected or not but small dripstone appear to happen very often....

What I expected to happen was...:
both biomes have the same rarety

What actually happened was...:
dripstone appear to spawn less than the lush cave

Steps to Reproduce:
1. Create a World on 21w44a
2. Explore a bit , and you will see this bug happening