On seed 6893705705259549051 at the nearest monument to spawn there is a geode overriding it.
It doesn't make sense for a "natural" structure to generate after a "built" structure.
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Whoops, this is a duplicate of MC-206648.
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I can confirm on another seed but it only seems to replace the blocks, but not the water.
In the given seed, it definitely replaces both. Not sure what the distinction would be.