The sticky piston doesn't work in one direction

Put the summary of the bug you're having here

What I expected to happen was:that block of red stone will be dragged to the sticky piston
Describe what you thought should happen here

What actually happened was he was not drawn in sticky piston
Describe what happened here

Steps to Reproduce:
1. Put a sticky piston face up
2. to put on the sticky piston block red stone
3 put the lever next to the sticky piston, and then turn on, and turn off the lever
3. ...