I have found a small issue where if you spam a lever to power a sticky piston that is pushing a slime block, the slime block sometimes doesn't get retracted when the piston head retracts.
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Duplicates MC-72801
This is not a bug, on the java edition sticky pistons drop their blocks when power with a pulse equal to or less than one redstone tick (2 game ticks or 0.1 seconds).