stretched UV map in generated mesh

I have problem with setting UV map for top, right, down, left and bottom faces.

  mesh.uv = new Vector2[] {
             new Vector2(v0.localPosition.x, v0.localPosition.y),
             new Vector2(v1.localPosition.x, v1.localPosition.y),
             new Vector2(v2.localPosition.x, v2.localPosition.y),
             new Vector2(v3.localPosition.x, v3.localPosition.y),
             new Vector2(v4.localPosition.x, v4.localPosition.y), 
             new Vector2(v5.localPosition.x, v5.localPosition.y),
             new Vector2(v6.localPosition.x, v6.localPosition.y),
             new Vector2(v7.localPosition.x, v7.localPosition.y),
             new Vector2(v8.localPosition.x, v8.localPosition.y),
             new Vector2(v9.localPosition.x, v9.localPosition.y),
             new Vector2(v10.localPosition.x, v10.localPosition.y),
             new Vector2(v11.localPosition.x, v11.localPosition.y),
             new Vector2(v12.localPosition.x, v12.localPosition.y),
             new Vector2(v13.localPosition.x, v13.localPosition.y),
             new Vector2(v14.localPosition.x, v14.localPosition.y),
             new Vector2(v15.localPosition.x, v15.localPosition.y),
             new Vector2(v16.localPosition.x, v16.localPosition.y),
             new Vector2(v17.localPosition.x, v17.localPosition.y),
             new Vector2(v18.localPosition.x, v18.localPosition.y),
             new Vector2(v19.localPosition.x, v19.localPosition.y),
             new Vector2(v20.localPosition.x, v20.localPosition.y),
             new Vector2(v21.localPosition.x, v21.localPosition.y),
             new Vector2(v22.localPosition.x, v22.localPosition.y),
             new Vector2(v23.localPosition.x, v23.localPosition.y),
         };

Problem occuring only when faces rotation is set to 0.