I have found a sand and Gravel duplication glitch in Minecraft pocket edition 1.0.6 It utilises sand falling onto a piston I found this by trying to make a falling sand garage door for my horses I used this double piston extender here: (https://www.youtube.com/watch?v=DTQGnMP3BX8) screenshots (look at my hotbar) bellow of how I have done it I only had 5 pieces of sand when I started making my garage door now I can fill it and have 7 extra this only gives you 1 at a time though.
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Confirmed on 1.1 / iOS and attached a test world, but sand, gravel, or whatever no longer dupes on this version.
Instead they either turn into item entities or simply disappear.
Also noticed that the glitch only happens when gravity-affected blocks falls directly on top of moving piston heads. When they are indirectly pushed by pistons through some other blocks, nothing interesting happens.
Confirmed on 1.1 / iOS and attached a test world, but sand, gravel, or whatever no longer dupes on this version.
Instead they either turn into item entities or simply disappear.
Also noticed that the glitch only happens when gravity-affected blocks falls directly on top of moving piston heads. When they are indirectly pushed by pistons through some other blocks, nothing interesting happens.
Closing as fixed - there may be some situations where the sand will break when falling on a moving piston, but that has been described as by design/won't fix. However, in the test world and examples, pistons can push vertical columns of sand without them breaking.