Huge redstone bugs

Pistons are now slower than before the dobble piston extender dosent working right!Redstone items like dust can be placed on glass !observer block cannot detect update from redstone ore ! Some times repeating command blocks are not working until you update them again pistons break all gravity block if they land on the piston head.when you clone a redstone contraption and if it has repeators on it they are on default dely even they look like on four. when loging in the world the redstone updates. And one bug that isnt redstone but i relly hate it when you are in a load screen and for ex. you are in the end the dragon can attack you while you are in load screen and he can push you to the void before you start defending your self