Minecraft wiki entry for Parity_issue_list, associated text: A powered unextended piston will immediately extend if it becomes able to rather than waiting for an update.
Blocks that contain block entities (except banners, signs, and campfires) can be moved by pistons.[feedback 12]
Break banners and signs, rather than being unable to extend.
Finish extending before retracting again.
Have a block entity; control pick blocking an extended piston will give a piston that deletes the block in front of it when placed.
Piston head model has a larger "neck".
Require 1 tick to retract.
Take longer to extend.
Have a 1 gametick delay between powering/depowering and extension/retraction
Check if they are powered/can extend every tick (instead of only when receiving a block update)
A sticky piston retracts its block even when given a 1 tick pulse.[note 7][52][53]