Few piston bugs

In Minecraft 1.4.7 redstone worked well, but in minecraft 1.5 (called "redstone update"...) pistons are bugging.... There are three bugs that destroy bigger redstone creations. Look on the video >> https://www.youtube.com/watch?v=hx_KK_iV9iY Mojang! Please repair these bugs!
P.S. I tested it on minecraft snapshot 13w22a.