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The master-file writer emits /entry/MX/indexedLatticeCount, but the reader only looked for indexingLatticeCount (the name used by the per-file MX plugin and data-file read path). Existing master files on disk therefore returned no indexed-lattice-count vector. Read the master's indexedLatticeCount first, falling back to indexingLatticeCount, matching the niggli_class/niggliClass compatibility pattern. The writer is left unchanged so already-written files keep working. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>