When slime blocks get moved by pistons they only set the motion of entities in their way, but don't move them.
This causes the entity to be inside the block for a short moment (see
).
It also can cause issues when pistons move in lazy chunks (chunks where entities don't get ticked) as the entities won't move.
Therefore I think it would be better if the entities would get moved by slime blocks as well as setting the motion.
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Dupe of MC-54954
This is not a dupe of MC-54954. This one here is about extending pistons as well. Slime blocks only "bounce" but don't move the entity. That is the issue here. The other bug post is about blocks that get retracted neither bouncing nor moving entities.
I just made an other post (MC-88101) which in fact is a dupe of MC-54954 but more detailed. So you just missed by a bit 🙂
This bug was fixed in 15w38b 🙂

Thanks!