Minecraft wiki entry for Development_versions, associated text: Fixed Structure Void block forcing player to spawn above ground if they left in a cave filled with those blocks.
Fixed bug where players could create an x-ray vision effect when inside a block below y=0 (MCPE-141130).
New random number generator used for overworld generation.
Fire Charge is not consumed anymore when used on lit Candles, Candle Cakes, Campfires, activated Nether Portals, or on other blocks that are already on fire.