Avoid duplicate quant metadata markers

comfy/utils.py

@@ -1412,6 +1412,11 @@ def _resolve_quant_metadata_layer_key(state_dict, layer_key, model_prefix):
             candidate = "{}{}".format(model_prefix, layer_key)
         if "{}.weight".format(candidate) in state_dict:
             return candidate
+    parts = layer_key.split(".")
+    for i in range(1, len(parts)):
+        candidate = ".".join(parts[i:])
+        if "{}.weight".format(candidate) in state_dict and "{}.comfy_quant".format(candidate) in state_dict:
+            return candidate
     return layer_key
 
 def convert_old_quants(state_dict, model_prefix="", metadata={}):

tests-unit/comfy_quant/test_convert_old_quants_prefix.py

@@ -176,6 +176,7 @@ class TestConvertOldQuantsPrefixAware(unittest.TestCase):
 
                 self.assertIn("proj_in.comfy_quant", sd,
                                f"{convention} metadata convention did not resolve after the two-call dance")
+                self.assertNotIn("model.diffusion_model.proj_in.comfy_quant", sd)
                 self.assertEqual(marker_json(sd, "proj_in.comfy_quant")["format"], "float8_e4m3fn")
 
     # ---- extra: repeated calls with identical inputs don't duplicate/clobber ----