When a stick piston (facing up) retract a carpet on a slime block, another carpet is created and pops off.

After the piston retracts, there is a carpet remains on the slime block, while another carpet is created and pops off. This bug can be used to generate carpets with a redstone clock.

Steps to Reproduce:
1. put a stick piston facing upward to a slime block
2. place a carpet on that slime block
3. activate the stick piston
4. deactivate the stick piston