Minecraft wiki entry for Development_versions, associated text: Walls now connect to most blocks placed above them (MCPE-65404)
Falling blocks are now broken by partial blocks that are placed above piston arms facing up
Mushroom Stems now drop the correct block when mined with a Silk Touch tool (MCPE-69012)
Target block redstone signal duration is based on projectile type, long for trident and arrows, short for other projectiles (MCPE-65413)
Redstone torches will no longer get stuck on or off when reloading the world (MCPE-48054)
The conditional setting for command blocks is now saved when copying via Structure Block
Fixed an issue which allowed Jack 'o Lanterns to be placed on the side of blocks, breaking some Marketplace content
Mushroom stems no longer drop brown mushroom blocks when silk touched (MCPE-69012)