Carpet non compadible upward with pistons whilst compadible sideways

Put the summary of the bug you're having here

What I expected to happen was...:
"THat the carpet would be puched upwards"

What actually happened was...:
"It didn't move"

Steps to Reproduce:
1.Create a redstone contraption that makes a piston push upwards
2.Put a carpet ontop
3.Start the redstone contraption.
(Optional) Do the same thing side ways