config fixes

src/backend/base/langflow/spec_flow_builder/config_builder.py

@@ -243,6 +243,32 @@ def _apply_config_to_node(self, node: Dict[str, Any], yaml_component: Dict[str,
             # Set the value in the template
             field["value"] = converted_value
 
+            # Mark as user-configured to prevent component updates from overwriting
+            field["user_configured"] = True
+            field["configured_from_spec"] = True
+
+            # Special handling for DropdownInput to preserve dropdown properties
+            if input_type == "DropdownInput":
+                # The template already contains options, options_metadata, combobox, etc.
+                # We only update the value, keeping all other dropdown properties intact
+
+                # Optional: Validate that the configured value is valid for this dropdown
+                options = field.get("options", [])
+                is_combobox = field.get("combobox", False)
+
+                # Only validate if options exist and combobox is disabled (strict dropdown)
+                if options and not is_combobox and converted_value not in options:
+                    logger.warning(
+                        f"Value '{converted_value}' for '{config_key}' in component '{component_id}' "
+                        f"is not in the available options: {options}. "
+                        f"This may cause issues unless combobox mode is enabled."
+                    )
+
+                logger.debug(
+                    f"Preserved dropdown properties for '{config_key}': "
+                    f"options={len(options)} items, combobox={is_combobox}"
+                )
+
             # Set advanced to false for any field configured in YAML
             if "advanced" in field:
                 field["advanced"] = False