cells_material is added to the per-layer JSON only when at least one entry is non-zero, so v0.5.6-vintage maps with no cell-tile content write byte-identical output through the 0.5.7 serializer. Maps with cell-tile content round-trip the array through save and reload. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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