Steps to reproduce:
- Extend a piston facing sideways.
- Place a 2 high solid block in front of the extended piston head.
- Place a snowlayer on top the piston arm.
- Retract and immediately extend the piston before the falling snowlayer touch the ground.
(Repeat the step above if the snowlayer stay at the top)
MCPE-14519 was fixed, you can do this with redstone.