message: MINOR: Enable depth write for ground plane.
  This is needed to make sure that three.js objects that are added to the scene by the are depth tested properly.
diff: @@ -1198,9 +1198,7 @@ export class Tile implements CachedResource {
  // TODO cache the material HARP-4207
  const material = new MapMeshBasicMaterial({
  color: colorHex,
  - visible: isVisible,
  - // All 2D ground geometry is rendered with renderOrder set and with depthTest === false.
  - depthTest: false
  + visible: isVisible
  });
  const plane = new THREE.Mesh(geometry, material);
  plane.position.copy(planeCenter);
  