Scaffolding block can float in air

If you make a tall scaffolding structure,then try to make it bigger, usually the last (4th i think) block of it falls down,to make a pillar. If you get close to the last block,and you click really quick,you can glitch the game making a floating scaffold block. This block doesn't only float but if you try to put any block under it,the scaffold block will go up once and the block you put will dissapear.