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)
If MCPE-14519 was fixed, you can do this with redstone.
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Confirmed for 0.15.6. (Tested on Windows 10.) Retracting a sticky piston head as described in my previous comment no longer crashes the game, but rather just deletes the block that is in the same spot as the piston head.
Confirmed for 0.15.0. (Tested on Windows 10.) Depending on how you time it, you can also delete blocks by pushing the snow layer into them before it finishes falling. If a sticky piston with a block in the same spot as its head tries to retract and pull another block, the game crashes.