The bedrock in caves can be uncovered but not destroyed by the new cave generation.
Some caves are being generated with bedrock in the ground
Bedrock interferes with new cave gen
bedrock exposed at the very bottom of the world.
Cave generation still exposes bedrock
Bedrock can again generate exposed
Bedrock is visible in deep caves
Chopped chunks, and Bedrock still appears in Deep dark caves
Lava does not generate at the very bottom of noise caves