meshName property doesn't affect rendering

It looks like the meshName property is ignored when loading a Wavefront file with Mesh and it ends up loading all the vertices/faces of the model:

Mesh {
    id: carMesh
    meshName: "13914_Taxi_car"
    source: "qrc:/Taxi/13914_Taxi_v2_L1.obj"
    onStatusChanged: { console.log("Taxi: status=" + status); }
}

Upon inspecting the 13914_Taxi_v2_L1.obj , I can see it defines named groups using the g tag, as in:

...

g 13914_Taxi_car
usemtl 13914_Taxi_car
s 2
f 37559/39651/36283 37560/39652/36284 37561/39653/36285 37562/39654/36286  
...

So I would expect Mesh to be able to load just this part of the model. Am I right to assume this?

Unfortunately, using a meshName that doesn't exist in the wavefront file also doesn't generate errors/warnings/problems and the entire mesh gets loaded instead.

I attached a small, reproducible and compilable example to this ticket that also contains the 3D model to facilitate testing.

Am I using it wrong? The documentation is almost non-existent on this topic.