So, I just created a new world in snapshot 24w40a, and the world generation is really bad, just look at the screenshot I just took
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We're tracking this issue in MC-30607, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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This is normal generation.
That's just a "bad" seed you had. It's not a bug.