When you put blocks that are affected by falling if there's nothing below them, they DISAPPEAR until they hit the ground

1 block, 10 blocks , 10000 blocks, literally doesn't matter what height are they falling from, it will occur everytime !!! 

So far I've tested on Sand, Red Sand , Gravel , Concrete Powder  and they all do the same thing.

HOW TO REPRODUCE :

Just put a block that is affected by gravity somewhere where it'll fall (down).