Rapidly turn on and off sticky piston with slimeblock and blocks on the sides

tried to lift blocks with slimeblock fast up and down

Block attached to the slimeblock duplicated

Steps to Reproduce:
1. place a block
2. redstone torches on the sides
3. redstone on the block
4. block over redstone torches (blinking)
5. Place a sticky on one of the block who is on the torch
6 Slimeblock on piston
7 attach blocks to slimeblock

8. sometimes the blocks wil duplicate