Layer Masks Set to Erroneous Value Regardless of Import Settings

[stultvox]

When a VRM model is imported, with only layer 1 selected, the model loads as if only layer 3 is selected.

At first, the only thing I noticed was that the lighting was not behaving as expected on the imported VRM models.
When I iterated through the MeshInstance3D objects in the VRM and printed the values for each layer, that's when I found it was all set to 3.

I did attempt reimporting the model with different layer settings. None of them seemed to make a difference in the outcome.
I also recalled that I had previously imported a gltf with the layer 3 set to true. So I imported another gltf file with the layer set to 1, and then imported a new VRM model, and it was still set to 3. So I do not believed it's picking it up from other imported gltf files.

I was able to work around the issue by iterating through all the layers in each MeshInstance3D for each VRM model, set them all to false, then set layer 1 (the desired layer) to true, placing that code in the ready function for the scene. It's not ideal, but it does work.

all_children = get_all_children($Characters)
for _i in all_children:
    if _i is MeshInstance3D:
        for _y in range(1,21):
            _i.set_layer_mask_value(_y,false)
        _i.set_layer_mask_value(1,true)