When trying to make a gravity block launcher, a friend and I found that with this setup, a gravity block consistently rubber-bands back to its original position through a piston head. Also the gravity block can sometimes end up offset by a partial block.
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This appears to be caused by a client-server desync, see MCPE-180988
Yea, seems to be the same issue. I will be resolving this as a duplicate of MCPE-180988. If you have any additional information you'd like to add, please head over there to make a comment. 🙂