In the first screenshot a piston pushing a redstone block upwards will remain powered even in direct power to the piston is off.
In the second screenshot 2 stacked pistons both pushing a redstone block, when retracted causes the lower piston to remain powered.
Related issues
Attachments
Comments

[media][media]

Duplicate of MC-108 , please use the search function to see if your bug has already been submitted. Currently over 40% of tickets are being closed as duplicate.