A redstone piston positioned to push up will not retract when the block pushed is a redstone block. If the redstone block, that is being pushed, is destroyed, the piston retracts.
When tested in a horizontal configuration, this works as expected. It also works when the piston is set to push down.
When tested with a stone block as the payload, the piston functions as expected and retracts when power is removed.
A small scale test is demonstrated in the attached photos.
Photo One: Piston is not powered in the original configuration
Photo Two: Power is applied. The piston extends and pushes the redstone block up.
Photo Three: Power is removed but the piston remains extended.
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187th 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 closed as duplicate.
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Tails, THIS IS A BUG. MC-108 only talks about piston extension in 1.4.5, not the latest snapshot/update which pertains to redstone blocks. This bug is also present in 1.6.2. Please as a member of the community re-investigate the bug, and if needed, ask me for a bug report. Thank you.
~Jouster500