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x: 1659, z: -486, seed: 3656903656520993401, world type: normal
That beach is actually a tiny desert biome.
Screenshot taken in snapshot 12w25a using MCEdit for the sign.
x: 1659, z: -486, seed: 3656903656520993401, world type: normalThat beach is actually a tiny desert biome.
This happens if you set the number of rows to 20...
Don't set the number of rows to something higher than 6.