puting amethyst on sides of block, then moving back and forth via pistons creates an easy shard duplication farm.
original post:
https://www.reddit.com/r/Minecraft/comments/jo7guw/i_found_a_way_to_dupe_amethyst_shards_from_the/
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We're tracking this issue in MC-203561 (private), so this ticket is being resolved and linked as a duplicate.
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