Minecraft wiki entry for Development_versions, associated text: MCPE-7891 - at (x,0,y), top of the texture of the block shows whereas the sides are invisible.
MCPE-7997 - Spawning on the soil above killing place in cave.
MCPE-8045 - Mobs can breed when separated.
MCPE-8123 - Entities invisible when at/above the height limit.
MCPE-8582 - Invisible bottom layer.