Strange issues with MeshReflectorMaterial and GLB geometries

[davcri]

I tried <MeshReflectorMaterial /> but I noticed a strange behaviour with geometries exported from Blender.

On the right I applied the material to a <planeGeometry /> and it works fine
On the left I applied the material to a Blender exported plane and the reflection is wrong.

MRE: https://codesandbox.io/p/sandbox/meshreflectormaterial-strange-behaviour-p63gh3?file=%2Fsrc%2FApp.js%3A33%2C31

Is this expected?

Just as a hint: I noticed that running this code "fixes" the reflection

function Comp() {
    const { nodes } = useGLTF('/models/plane.glb') // plane exported from Blender
    const planeThree = new PlaneGeometry(2, 2)
    const planeGLB = nodes['Plane']

    function fixGeom(g: BufferGeometry) {
        g.deleteAttribute('position')
        g.setAttribute('position', planeThree.attributes.position.clone())
        g.setIndex(planeThree.index!.clone()) // seems like position and index data is what differ from Blender and Three's planes
        g.computeVertexNormals()
    }

    fixGeom(planeGLB.geometry)

[davcri]

I guess <MeshReflectorMaterial /> expects vertices to have a specific local space position (eg: similar to THREE's default planeGeometry): the reflections works fine when using a plane.glb exported with the rotation applied to the vertices of the geometry.