Rarely, amethyst crystals will spawn in generation without its source, the amethyst geode. Im reporting this so generation can be improved in later snapshots. For the image below, I went into spectator mode. No geode was found. This can be reproduced without the caves + cliffs preview pack.
To reproduce
Version: 23w51b
Seed: 4942781640353635955
Coordinates: /execute in minecraft:overworld run tp @s 9645.10 -54.40 -345.66 946.41 -24.82
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I also have experienced this, but there was a geode present. The amethysts generated on stone brick
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Seed and coordinates please.

Please provide the seed and coordinates.
Went back to get this screenshot which shows seed and coordinates
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@unknown, try it with /execute in minecraft:overworld run tp @s -121.19 24.53 194.42 295.17 -56.69
See
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Coordinates: -873 29 -817
Seed: 1936846522361647470
There is one separate crystal in this geode,
Hmm, that's quite bizarre. Anyway, this can also be seen on the underside of these two particular amethyst geodes. See this command provided by @unknown. This perfectly demonstrates this issue, so just to clarify, you can use the following seed + coordinates to reproduce this issue:
Seed: 7217831341870558926
Coordinates: /execute in minecraft:overworld run tp @s -121.19 24.53 194.42 295.17 -56.69

Okay - I see what you are referring to now. This is a "feature overlapping feature" bug, where a geode will generate, then another feature (a geode, a monument, etc) generates over it because it comes later. It's not as much an amethyst crystal generating on a non-budding amethyst block as much as it is another feature coming in later and replacing the budding amethyst block, which is unfortunately a complex issue 🙂 Thanks for all the feedback!
No worries 😃
Hi! Could you please provide seed and coordinates?