Mojang Studios is hard at work on 1.18 'Caves and Cliffs Update' Part Two, which hopefully arrives later this year. Before 1.18 changes can be tested with regular snapshots and betas, Mojang Studios ...
When generating close to old chunks hew terrain is adjusted to better match the existing terrain at the borders In old chunks, if there is Bedrock at y=0, the column below will be filled with ...