pushed upwards slime blocks dont bounce players

I noticed this when building a 'bouncy castle' utilizing slime blocks under a piston to push players up levels.

As of last week, the slime pistons no longer push players into the air - however it still works for entities I think - as a player on a horse got bounced.

The block gets pushed up no problems, but the player just stays glued to it, not achieving any air time at all.