A block was placed on the redstone torch and the repeater was left on. The command in the command block replaces the block above the redstone torch with air.
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duplicates 1
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Duplicate of MC-51543
Is this still a concern in the current Minecraft version 14w21b / Launcher version 1.4.4 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.