diff --git a/invokeai/backend/model_manager/configs/unknown.py b/invokeai/backend/model_manager/configs/unknown.py
index 2371cca089..a145091452 100644
--- a/invokeai/backend/model_manager/configs/unknown.py
+++ b/invokeai/backend/model_manager/configs/unknown.py
@@ -1,3 +1,4 @@
+from copy import deepcopy
 from typing import Any, Literal, Self
 
 from pydantic import Field
@@ -32,6 +33,11 @@ class Unknown_Config(Config_Base):
         if not app_config.allow_unknown_models:
             raise NotAMatchError("unknown models are not allowed by configuration")
 
+        cloned_override_fields = deepcopy(override_fields)
+        cloned_override_fields.pop("base", None)
+        cloned_override_fields.pop("type", None)
+        cloned_override_fields.pop("format", None)
+
         return cls(
             **override_fields,
             # Override the type/format/base to ensure it's marked as unknown.