Minecraft wiki entry for Development_versions, associated text: MCPE-8424 – When breaking a block in front of me, it breaks the one I'm on.
MCPE-11796 – Nether Wart only drops one Wart when broken
MCPE-12279 – Lever, buttons, redstone, etc. can not be placed on monster spawner
MCPE-14691 – Skins not showing up in skins area
MCPE-14971 – Skeleton Horses & Zombie Horses Bug