diff --git a/packages/reflection/lib/src/core/runtime_reflector.dart b/packages/reflection/lib/src/core/runtime_reflector.dart
index 0aa9dc9..696056a 100644
--- a/packages/reflection/lib/src/core/runtime_reflector.dart
+++ b/packages/reflection/lib/src/core/runtime_reflector.dart
@@ -97,11 +97,12 @@ class RuntimeReflector {
         // For scanner-style factory, pass args as two positional parameters
         return Function.apply(factory, [positionalArgs, namedArgSymbols]);
       } else {
-        // For direct-style factory, wrap it to match scanner-style signature
-        final wrappedFactory = (List args, [Map<Symbol, dynamic>? named]) {
-          return Function.apply(factory, args, named);
-        };
-        return wrappedFactory(positionalArgs, namedArgSymbols);
+        // For direct-style factory, pass args directly
+        if (namedArgs.isEmpty) {
+          return Function.apply(factory, positionalArgs);
+        } else {
+          return Function.apply(factory, positionalArgs, namedArgSymbols);
+        }
       }
     } catch (e) {
       throw ReflectionException('Failed to create instance: $e');
diff --git a/packages/reflection/lib/src/core/scanner.dart b/packages/reflection/lib/src/core/scanner.dart
index 96f168b..5a1b80d 100644
--- a/packages/reflection/lib/src/core/scanner.dart
+++ b/packages/reflection/lib/src/core/scanner.dart
@@ -104,15 +104,9 @@ class Scanner {
           final name = positionalArgs[0] as String;
           final age = positionalArgs[1] as int;
           return Function.apply(typeObj, [name, age], {});
-
-        default:
-          // For unknown types, create a generic factory that applies the arguments directly
-          return Function.apply(
-            constructor.name.isEmpty ? typeObj : typeObj[constructor.name],
-            positionalArgs,
-            namedArgs,
-          );
       }
+
+      throw UnsupportedError('Cannot create instance of $typeName');
     };
   }
 }