When using slimes and sticky pistons/any pistons with redstone clock will dupe the amethyst shards if placed on each sides of the slime block while the piston is activated by the redstone clock

Steps to reproduce

1. Grab any type of pistons
2. Grab a slime block
3. Grab an amethyst shards
4. Place the piston anywhere you want (Must be facing upwards) 
5. Place the slime block abobe the piston so it would be pushed
6. Make a redstone clock then a redstone dust going to the piston
7. Activate it

Observed results

The amethyst shards will begin to dupe here's the video link

https://m.youtube.com/watch?v=ZLvlsPhjmNs

Expected results 

The amethyst shards should break instantly