[Core/Reflection] Fix ProxyObject RuntimeBinding fallback

Attempt to initialize the default type with the uninitialized type instance.

MTGOSDK/src/Core/Reflection/ProxyObject.cs

@@ -20,9 +20,6 @@ public class ProxyObject(
 {
   public override bool TryGetMember(GetMemberBinder binder, out object result)
   {
-    Type returnType = binder.ReturnType;
-    dynamic typeDefault = RuntimeHelpers.GetUninitializedObject(returnType);
-
     // First attempt to retrieve the member from the base object.
     try
     {
@@ -38,9 +35,24 @@ public override bool TryGetMember(GetMemberBinder binder, out object result)
       catch(Microsoft.CSharp.RuntimeBinder.RuntimeBinderException)
       {
         var value = @base.GetType().GetProperty(binder.Name).GetValue(@base);
-        result = (value != null && value != typeDefault)
-          ? value
-          : @default ?? value;
+        try
+        {
+          // Get the default value for the return type.
+          Type returnType = binder.ReturnType;
+          dynamic typeRef = RuntimeHelpers.GetUninitializedObject(returnType);
+          dynamic typeDefault = typeRef
+            .GetType()
+            .GetConstructor(Type.EmptyTypes)
+            .Invoke(typeRef, null);
+#pragma warning disable CS8601
+          result = (value != null || value != typeDefault)
+            ? value
+            : @default ?? value;
+#pragma warning restore CS8601
+        } catch
+        {
+          result = value ?? @default;
+        }
 
         return true;
       }