Why are items gone????

I was super excited about the new updates and the new blocks but when I logged into Minecraft a few of the blocks were missing the like the piston did you delete it from the game or...I did something that could have caused it on my profile if youre u have an idea please tell me. But still FIVE STARS BEST GAME EVERRRRRRRRR

CactiHannah about Minecraft: Pocket Edition, v1.1.4