weird glitch where PISTONS can be powered with no redstone attached

if i use a comparator and use it in a roew like this:

r= redstone                                              P

c=comparoator                                    R C R                

f=furnace is under Redstone              R F R                                          

b=redstone block                                 F B F

p=power source       

if you place a slime block under the Redstone then connect a piston to it, facing up, place a block next to the piston, and delete the slime and piston, you can now place a piston in a bunch of spots that will automatically be powered.

IDK how to send a screenshot, but if you get my number I can send you a video and a picture     

i doubt anyone will find this accidentally, and i have no idea how i found it