Wrong transform when an instanceable prim is not xformable

We have some repro scenes rendering instanceable prims with wrong transform. This seems to happen when the instanceable prim is not xformable. For example : 

```
def Xform "Xform1"
{
    double3 xformOp:translate = (2, 0, 0)
    uniform token[] xformOpOrder = ["xformOp:translate"]

    def "cube_1" (
        references = @./cube.usda@</cube>
    )
    {
    }
}

```