When I place a piston under a slime block, and then two pistons next to it, like in the picture, and then extend it (and the redstone is correct) it will push the slime block up, then when I try to retract it sometimes it will pull down the slime block and other times it will not. It is not a directional glitch, and the redstone works on others, but sometimes, at random, it does not pull the slime block back.
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This is not a bug.... A slime block can move other blocks but a piston can't move 15 block.
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Simple test without any other blocks around the slime block. Slime block started against the piston. When button is pushed, the slime block and upward facing piston are pushed out but only the bottom piston is pulled back.
Edit: Upon further testing, it doesn't matter what the block under the piston is. I replaced the upward facing sticky piston with a stone block and the slime block would not retract.
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That is not a bug, that is intentional on normal Pistons
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You only need 2 pistons because the slime block can move that piston underneath it and the sticky piston can move that slime block.
That piston which move another piston can block the piston above it.
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It seems that since the slime block is attached to a another block that is attached to an extended piston, it won't pulll back that block. I replaced the bottom sticky piston with a normal piston and had the same effect. Putting the slime block on the bottom and another block on top, the slime block will retract. My conclusion is that the top piston will update before the bottom so it would register that the slime block is trying to move an extended piston (which can't be done).
kumasasa