When trying to use a Sticky Piston with a Slime Block to push and Armor Stand horizontally, the piston won't move.
I believe it should work as it has in the past and the Armor Stand would bounce due to the slime block.
To reproduce, just put a Slime Block on a Sticky Piston and try to activate with a repeater going into a block below the Sticky Piston.
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Is your setup more than 12 blocks long? If so, the slime blocks would be too great a quantity to be pushed by the pistons.
Attach a screenshot of the setup.