When I place a piston like shown at the screenshots they glitch out after a few seconds (it happens with sideways pistons too). This bug also happened when I tried to make an automatic cocoa bean harvester. It has been around sice at least minecraft 1.2.5
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Duplicate of MC-127.
Edit: Sorry copied full response^^
Jeuv
I did search for bugs like this but I didn't know mc-127 was the same bug as this one.