In the setup pictured, sticky pistons won't retract slime blocks.
When 2 sticky pistons are next to each other and they push 2 adjacent slime blocks, they won't pull the slime blocks back when they retract.
Doesn't affect a single piston and slime block, but does if 2+ are present.
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It seems the slime won't move because it tries to pus down the other piston extentions which it cannot do.

It seems the slime won't move because it tries to pus down the other piston extentions which it cannot do.

It seems the slime won't move because it tries to pus down the other piston extentions which it cannot do.