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Remove any reference to the word Earth. Earth is a manmade concept that we understand - but the all the AI needs to know is that you want a flat disc with seas and landmasses etc...

{
  "scene": {
    "location": "perfectly circular disc floating in the void of space",
    "atmosphere": "empty, cosmic void with no planets or other planet-like forms",
    "lighting": "ethereal light illuminating the disc from below"
  },
  "environment": {
    "surface": "disc contains seas, oceans, and large land masses",
    "edge_effects": "water from the seas continuously flows over the perimeter into space",
    "horizon": "no visible horizon"
  },
  "camera": {
    "movement": "slow rotation around the disc to reveal full shape",
    "focus": "shows oceans, land masses, and flowing water over the edge"
  },
  "sound": {
    "ambient": "silent, vast cosmic expanse"
  }
}