Fix some fp8 scaled checkpoints no longer working. (#13239)

Author: comfyanonymous

comfy/sd.py

@@ -1724,6 +1724,8 @@ def load_diffusion_model_state_dict(sd, model_options={}, metadata=None, disable
     temp_sd = comfy.utils.state_dict_prefix_replace(sd, {diffusion_model_prefix: ""}, filter_keys=True)
     if len(temp_sd) > 0:
         sd = temp_sd
+        if custom_operations is None:
+            sd, metadata = comfy.utils.convert_old_quants(sd, "", metadata=metadata)
 
     custom_operations = model_options.get("custom_operations", None)
     if custom_operations is None: