Stronger opinion check blocking valid Usd edits.

Hi,

We are having an issue with newer versions of the MayaUsd plugin blocking valid Usd edits.

Printing the error `Cannot edit [variantSelection] attribute because there is a stronger opinion in [some layer]. //`

I'm trying to edit a variant selection, in the animation sub layer, which sits higher than our layout sublayer.

This worked fine in 0.19.0, stopped working in 0.20.0 and still doesn't working in 0.21.0

To demo the issue I've recorded a video -

[https://www.dropbox.com/s/je89yt4bhjs2a5c/strongerLayerError.mp4?dl=0](https://www.dropbox.com/s/je89yt4bhjs2a5c/strongerLayerError.mp4?dl=0
)

Here is a link to the project files -

[https://www.dropbox.com/s/qy9ikkpuq9gsrjl/strongerLayerError.zip?dl=0
](https://www.dropbox.com/s/qy9ikkpuq9gsrjl/strongerLayerError.zip?dl=0
)
The shot Maya file is -
_strongerLayerError/scenes/shots/e01/01/020/animation/base/workspace/previsExport_lunar_v000.ma_
The Usd files are all using relative paths, so should work out of the box.

This issue is completely blocking us from moving to any version higher than 0.19.0 as we rely on the variant selection to activate our Maya rigs via the Maya reference schema, and is frustrating not being able to change a models variant at the animation stage.

If someone could look at this for us it would be much appreciated.

Thanks,
David.

Specs :
_macOS 12.0.1
Maya 2023.2
Maya Usd 0.19.0 and 0.21.0_