Minecraft: Bedrock Edition Beta 1.18.0.20 is the first proper release for 'Caves and Cliffs Update' Part Two
Minecraft: Bedrock Edition Beta 1.18.0.20 is now rolling out to players, representing the first proper beta sitting under the 1.18 version number umbrella. All the experimental features and changes from 'Caves and Cliffs Update' Part Two are now being offered to all players in the general beta.
Source: windowscentral.com