Not a bug but the new blocks(like cooler, grill and diving board) destroyes instantly in survival.

And if you use an inventory editor (tmi,nei,jei...) you will find a lot of stuff :)
Like item.item_crayfish.name and item.item_money.name, a very small chrismas tree and (probably some sort of easter egg) the Rave Couch(Rainbow Couch)

Those are secret items

Fixed blocks breaking instantly in ce5dd1c