Using a redstone contraption, you can move a piston that is extending to put a piston arm in a block, and then it deletes the block that it was moved into, it does not work for bedrock, only command blocks, that i know of
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I think this is because pistons in bedrock edition can sometimes be moved while extending then the piston arm replaces the block in front of it. Gnembon actually showed this in ver.1.2 in his tree farm. This is a pretty old bug although partially fixed now.