Baking NavMesh with 3d Colliders produces no visible results

To reproduce:
1. Open attached project
2. Open 2DMesh.unity scene
3. Select Cylinder game object
4. Click Bake button on NavMeshSurface component
Expected result: A Visible nav mesh appears
Actual result: No nav mesh appears

Notes:
BackgroundSprite object has a 3D Collider which should be baked;
NavMesh Surface Component is set to FitToScene;
NavMesh Surface Component is set to Physics Collider geometry;

By design because: The component had Use Children Only enabled, which makes it so, that the component only looks for bakeable surfaces in it;'s children objects.