update

src/Internal/Editor/MetaObjectsDropDown.cs

@@ -163,7 +163,7 @@ namespace DCFApixels.DragonECS.Unity.Editors
 
             if (_fieldProperty != null)
             {
-                _fieldProperty.managedReferenceValue = cmptmp.Clone();
+                _fieldProperty.managedReferenceValue = cmptmp.Clone_Reflection();
                 _fieldProperty.serializedObject.ApplyModifiedProperties();
             }
         }

src/Internal/ReflectionExtensions.cs

@@ -33,6 +33,20 @@ namespace DCFApixels.DragonECS.Unity.Internal
         {
             return self.IsSubclassOf(typeof(UnityObject));
         }
+
+        private static MethodInfo memberwiseCloneMethdo = typeof(object).GetMethod("MemberwiseClone", BindingFlags.Instance | BindingFlags.NonPublic);
+        internal static object Clone_Reflection(this object obj)
+        {
+            if (obj is ICloneable cloneable)
+            {
+                return cloneable.Clone();
+            }
+            return memberwiseCloneMethdo.Invoke(obj, null);
+        }
+        internal static object Clone_Reflection<T>(this T obj)
+        {
+            return Clone_Reflection((object)obj);
+        }
     }
 }
 #endif

src/Templates/EntityTemplate/Editor/ComponentTemplatePropertyDrawer.cs

@@ -50,7 +50,7 @@ namespace DCFApixels.DragonECS.Unity.Editors
         private static void SelectComponent(ComponentTemplatesDropDown.Item item)
         {
             //EcsGUI.Changed = true;
-            currentProperty.managedReferenceValue = item.Obj.Clone();
+            currentProperty.managedReferenceValue = item.Obj.Clone_Reflection();
             currentProperty.isExpanded = false;
             currentProperty.serializedObject.ApplyModifiedProperties();
         }

src/Templates/EntityTemplate/Templates/ComponentTemplateBase.cs

@@ -87,6 +87,7 @@ namespace DCFApixels.DragonECS
                             _defaultValueType = (T)field.GetValue(null);
                         }
                     }
+                    _defaultValueTypeInit = true;
                 }
                 return _defaultValueType;
             }
@@ -144,22 +145,6 @@ namespace DCFApixels.DragonECS
     }
 }
 
-namespace DCFApixels.DragonECS.Unity.Internal
-{
-    internal static class ComponentTemplateExtensions
-    {
-        private static MethodInfo memberwiseCloneMethdo = typeof(object).GetMethod("MemberwiseClone", BindingFlags.Instance | BindingFlags.NonPublic);
-        internal static IComponentTemplate Clone(this IComponentTemplate obj)
-        {
-            if(obj is ICloneable cloneable)
-            {
-                return (IComponentTemplate)cloneable.Clone();
-            }
-            return (IComponentTemplate)memberwiseCloneMethdo.Invoke(obj, null);
-        }
-    }
-}
-
 #if UNITY_EDITOR
 namespace DCFApixels.DragonECS.Unity.Editors
 {
@@ -181,10 +166,10 @@ namespace DCFApixels.DragonECS.Unity.Editors
             Type interfaceType = typeof(IComponentTemplate);
 
             _types = UnityEditorUtility._serializableTypes.Where(type => interfaceType.IsAssignableFrom(type)).ToArray();
-            foreach (var type in _types)
-            {
-                EcsDebugUtility.GetTypeMeta(type);
-            }
+            //foreach (var type in _types)
+            //{
+            //    EcsDebugUtility.GetTypeMeta(type);
+            //}
             _dummies = new IComponentTemplate[_types.Length];
 
             for (int i = 0; i < _types.Length; i++)