Minecraft wiki entry for Development_versions, associated text: Ore generation has now been tweaked to be in parity with Java Edition.
Gravel can now correctly replace Deepslate during world generation (MCPE-144080).
Gold Ore in Badlands biomes are no longer generating in too large of quantities.
Lava sources are no longer generated in Frozen Ocean biomes (MCPE-144733).
Deepslate Copper Ore variant is now correctly generating in the world.
Updated naming for new Caves & Cliffs mountain biomes to better match between Bedrock and Java Edition.