When you place the pison it extends.
When you toggle the redstone off the retracts
but when you toggle it back on it does nothing because you need a block update.
This works with sticky piston and normal piston.
I did this in mid air so you whould see that there is no hidden lever/torch.
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190th Duplicate of MC-108, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.