Slimeblocks seem to not get pulled by sticky pistons in certain situations.
Think it is probably easier to explain the problem with a video:
https://www.youtube.com/watch?v=NOgBDMZfvVQ
Also, this setup (all three pistons are sticky), the button on the blue wool will drop the slime block while the red wool-button will work as expected.
So I guess it has something to do in which order the pistons are activated, maybe. 🙂
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Confirmed.

What's happening in the set of 3 screenshots:
-The top piston is retracted first, but can't pull the slime block, as the slime block is attached to the vertical piston which in turn is blocked by the lower piston (still extended)
-Then, the lower piston retracts, without the slime block
To create a functioning mechanism, remove the lower horizontal piston. The slime block will bring the vertical piston when it is retracted.

Thanks for the explanation.