The latest Bedrock Edition beta introduces "4 new ambient cave sounds". (https://feedback.minecraft.net/hc/en-us/articles/26100457790093-Minecraft-Beta-Preview-1-21-0-23) To my knowledge, 1.20.5 did not add any new cave sounds, making this a parody issue. Since the cave ambience is an already existing sound event, this should count as a valid parity issue.