Understand the world before you trust it

  getFinalBlock(localX, localY, localZ) {
    if (!containsLocal(localX, localY, localZ, this)) return BLOCK_ID.air;
    if (!this.pendingDeltas.size && !this.chainDeltas.size) return this.getBaseBlock(localX, localY, localZ);
    const key = deltaKey(localX, localY, localZ, this.chunkSize);
    const pending = this.pendingDeltas.get(key);
    if (pending) return pending.blockId;
    const chain = this.chainDeltas.get(key);
    if (chain) return chain.blockId;
    return this.getBaseBlock(localX, localY, localZ);
  }

Pending edits remain separate and reversible. The internal chainDeltas collection overrides the base, while untouched cells fall through to canonical generation. Because local Confirm and Guardian hints can also populate that render layer, a separate validated RPC snapshot is required before calling it shared chain state.

export function getBlockAt(worldSeed, worldX, worldY, worldZ, ruleVersion = DEFAULT_GENERATION_VERSION, options = {}) {
  const config = createWorldGeneratorConfig({ ...options, worldSeed, generationVersion: ruleVersion });
  const x = Math.trunc(worldX);
  const y = Math.trunc(worldY);
  const z = Math.trunc(worldZ);
  return blockAtConfig(config, x, y, z);
}

The public query normalizes the world position to integer voxel coordinates and passes the selected seed and ruleVersion into configuration; the current generator has no version-dependent branch.