When playing on a 14w26b world, and I play the same world on 14w26c, my torches, chest, crafting table, and furnace all disapeared. To replecate, create a world with an older snapshot (mine was 14w26b) place down things like torches and chests. Then, go back to that world in 14w26c. ( Also note that even with the torches gone, the light is still there. Also note that none of the missing blocks are invisible. They are simply gone.)