The "structure_starts" field in biome JSON files no longer exists. This doesn't seem intended as you can no longer change the way structures generate, unlike how it was in 1.17.1.
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We're resolving and linking this ticket forward as a duplicate of MC-241288, as that ticket contains more detailed information and/or has already been triaged by Mojang.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Duplicate of MC-241288. (That has more votes, is more in-depth and has more activity)