Some Redstone-based blocks (But most noticeably on Pistons) reacts extremely odd if it receives its power from a Redstone Block placed 2 blocks above it (MC-108).
It's difficult to explain fully, so I've made a short video of me experimenting with the bug, but a simple explanation would be that Redstone Blocks placed 2 blocks above (At least in my testing) Pistons are extremely unreliable, and require the player to manually give the Piston a nearby block update, whether that be placing a block, breaking a block, interacting with an entity etc. otherwise the Piston will sometimes extend itself without a power source.
I would further move to re-evaluate MC-108 (Specifically Redstone Blocks being able to power things 2 blocks below them), make it a bug, and fix it. Players are able to build devices in which pistons swap blocks between each other horizontally, but not vertically because of this issue.
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Are you serious? Did the attachment of the piston powering itself not prove that this is a completely separate bug? Did y'all even watch the linked video?
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Nothing happened, no comments, no changes to the report, nothing.
It is the exact same thing as MC-108, the only thing that distinguishes it and this is this report seemingly being about the required additional block update, which is in itself a valid concern.
ConfusedStorm26
I agree. I reported the same thing yesterday; I didn't see this bug report, and Dhranios called mine (MC-263511) a duplicate of this bug. No copying of this report was intentional in any way. My apologies.