Getting to the way it's supposed to be!

modules/ufbx/data/synthetic_partial_attrib_0_obj.obj

@@ -0,0 +1,27 @@
+v 1 2 3
+v 4 5 6
+v 7 8 9
+v 1 2 3 1 0 0
+v 4 5 6 0 1 0
+v 7 8 9 0 0 1
+vt 0 0
+vt 1 0
+vt 1 1
+vn 1 0 0
+vn 0 1 0
+vn 0 0 1
+
+g Mesh
+f 1 2 3
+f 1/1 2/2 3/3
+f 1//1 2//2 3//3
+f 1/1/1 2/2/2 3/3/3
+f 4 5 6
+f 4/1 5/2 6/3
+f 4//1 5//2 6//3
+f 4/1/1 5/2/2 6/3/3
+f 0 100 -100
+f /1 100/2 -100/3
+f //1 100//2 -100//3
+f /1/1 100/2/2 -100/3/3
+