fix constructor order

this fixes the element getting owner set to null

Author: Angel-foxxo

ICodec.cs

@@ -256,12 +256,11 @@ public static bool TryConstructCustomElement(Dictionary<string, Type> types, Dat
 
             object uninitializedObject = RuntimeHelpers.GetUninitializedObject(derivedType);
 
-            elementConstructor.Invoke(uninitializedObject, [dataModel, elem_name, elem_id, elem_class]);
-
             // this will initialize values such as
             // public Datamodel.ElementArray Children { get; } = [];
             customClassInitializer.Invoke(uninitializedObject, []);
 
+            elementConstructor.Invoke(uninitializedObject, [dataModel, elem_name, elem_id, elem_class]);
 
             elem = (Element?)uninitializedObject;
             return true;