When placing power 2 blocks above a piston, the piston does not activate--this is normal behaviour. When placing a piston 2 blocks below a power source, the piston activates.
Discovered in SMP, able to reproduce on single-player Creative.
The screenshot shows the setup that produces this behaviour.
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219th Duplicate of MC-108, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being resolved as duplicate.