normalizeToUnitCube not working with imported .glb files for NullEngine

Questions
1 
LoadAsset(scene, path, fileName) {
    const result = await SceneLoader.ImportMeshAsync("", path, fileName, scene);
    // Get the bounding box information (min and max)
    const mesh = result.meshes[1];
    const boundingInfo = mesh.getBoundingInfo();
    const boundingBoxMin = boundingInfo.boundingBox.minimum;
    const boundingBoxMax = boundingInfo.boundingBox.maximum;

    // Dispose of the mesh
    mesh.dispose();
    const box = MeshBuilder.CreateBox(
      `boundingBox`,
      {
        width: boundingBoxMax.x - boundingBoxMin.x,
        height: boundingBoxMax.y - boundingBoxMin.y,
        depth: boundingBoxMax.z - boundingBoxMin.z,
      },
      scene
    );
    box.position = boundingBoxMin.add(boundingBoxMax).scale(0.5);
    box.url = fileName;
    box.normalizeToUnitCube();
    return box;
  }

This is my code when I try normalizeToUnitCube method with CreateBox object it scales fine. But unable to make it work with imported meshes with draco compression. Please let me know if I am missing something?
Thank You

2

Are you able to make it work with imported meshes without draco compression?

Is it always a mesh with geometry?

Here is the example of your function with Draco compressed mesh - https://playground.babylonjs.com/#3ZYJ26#2