R3F cloned mesh clone material not working

Question

I'm reusing a mesh several times, so I cloned it. I applied new materials to each clone. Unfortunately, when I change the material of one Mesh, it affects all meshes.

Here is my code simplified:

switch (filetype) {
  case "fbx":
    mesh = LoadFBX(path).clone();
    break;
  case "glb":
    mesh = LoadGLTF(path).clone();
    break;
  case "gltf":
    mesh = LoadGLTF(path).clone();
    break;
  case "obj":
    mesh = LoadOBJ(path).clone();
    break;
}

mesh.traverse((mesh, i) => {
  if (mesh.isMesh) {
    if (mesh.material.length) {
      for (let i = 0; i < mesh.material.length; i++) {
        mesh.material[i] = mesh.material[i].clone();
        if (selected) {
          mesh.material[i] = new MeshStandardMaterial({
            color: 0x000f40,
          });
        } else {
          let matTemp = new MeshStandardMaterial({
            color: 0x000000,
          });
          mesh.material[i] = matTemp;
        }
      }
    } else {
      mesh.material = mesh.material.clone();
      if (selected) {
        mesh.material = new MeshStandardMaterial({
          color: 0x000f40,
        });
      } else {
        let matTemp = new MeshStandardMaterial({
          color: 0x000000,
        });
        mesh.material = matTemp;
      }
    }
  }
});

I tried cloning the materials as well, by using these phrases:

mesh.material[i] = mesh.material[i].clone();

and

mesh.material = mesh.material.clone();

But that didnt change anything.

I also tried cloning the new materials:

mesh.material[i] = matTemp.clone();

and

mesh.material = matTemp.clone();

Still not the right way. Can you help me?