Issue with Pistons and slime blocks

I noticed after this hotfix there is an issue with slime blocks on top of pistons. They don’t push the player up vertical.

To replicate bug: place piston on ground. Then place a slime block on top of the piston. When the piston is activated the player should be launched vertical and be on the same X and Z coordinates that they launched from. But this bug causes the player to land elsewhere. This bug breaks piston elevators.