When an Amethyst Crystal Cluster is pushed directly by a piston (not on a block that is being moved by a piston but being directly in front of the piston face), crystal items drop however the block is not actually broken.
The video explains all.
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is duplicated by 35
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[media]
This exlplains how bad this is; I made a farm out of it.
[media]This is the output amount...
It OVERFLOWS the hoppers...
Setting to private because it's a duplication bug.