If you place a redstone block on a sticky piston then trigger the piston with a lever the piston will stay until the redstone block is destroyed, even if you flip the lever or destroy it.
Just redstone on the piston doesn't trigger it but once it's extended it doesn't stop.
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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
Duplicate of MC-108 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.