If there are two pistons up and there is a slime block and a different type of block in front of the two pistons, the slime block will sometimes not pull.
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We're tracking this issue in MCPE-16371, so this ticket is being resolved and linked as a duplicate.
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This is because of random piston update order. The piston trying to pull the slime back is blocked from doing so because the other piston is still extended (50% of the time). Remove the lower piston and it should work. Random piston update order is WAI, so I suspect this may be WAI too.