“export USDZ” not exporting new materials / AR issue

Hi, this is just a simple case of what I’m trying to achieve with the AR mode

I have a green cube that export perfectly into AR mode

but if i try to apply a new material to it (like red) and I export it again, it will keep the base material “green” and not export with the new red material.

try it : https://v3d.net/133h

if someone has ever faced this issue, i’ll be happy to hear it

more info :

it does the same if i set the export usdz to the “cube” model and not to the “scene”.