Hi Shogoun,
I don't think that this is a AMD GPU only type of problem. I have an RX 7900XTX, but my friend have RTX4090 and he's having the same textures problems as I do with A-400M. So from what I know so far, it's a problem for both AMD and Nvidia. But if you want, I can share those A-400M textures I currently have and are working for me. I've tried numerous fixes that others shared in this topic to a point, where I got lost and forgot which one is working for me right now. But It just works so...