The down line of pistons should be push down by the top pistons, but only one on two is push, because down pistons become BUD when the redstone is activate, and they are instantly updated, and extends.
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Duplicate of MC-9363, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.

Sorry, but I search this a issue and i don't find it because the MC-9363 have bad title and bad labels