Graphics of the glass is gone while a block is placed beside. Redstone repeaters not working the way it should.

I'm running mcpe on my zenfone 2 4G/64GB version. Recently I've just found out that when u put a block beside a glass block the side which is touched together will be a blank. In the picture i put a pressure plate beside th glass block and the side whih is connected disappered. In the second picture i put a pressure plate under the glass block it disappeared also but other sides is still visable.
When a redstone repeater is powered itshould power the block in the front and also the block underneath but in the picture u see the blockwhich is under doesn't have power.