Minecraft wiki entry for Development_versions, associated text: Re-entering a Caves & Cliffs world when in a danger zone at a valid negative Y position no longer teleports player to positive Y (MCPE-141039)
Copper Ore now drops 2-5 (from 2-3) Raw Copper items (MCPE-144071)
In the Stonecutter, a Block of Copper can be converted to four Cut Copper (MCPE-144067)