Observers powering pistons moving observers powering repeaters causes it to power when there is an air block between (observer on top is not necessary, piston just needs to get a 1-tick pulse)
Observers powering pistons moving observers powering repeaters causes it to power when there is an air block between (observer on top is not necessary, piston just needs to get a 1-tick pulse)
This is expected behavior, as the piston arm is updating the observer's face, sending power to the repeater before the observer is then pulled away.