Практически доделанный кодген, но не работает демка

Example.Backend/Printer.cs

@@ -10,6 +10,10 @@ namespace Example.Backend
     {
         public string Name;
 
+        public void OnPrintExternal(IPage p0, RequestContext p1)
+        {
+        }
+
         public double Resource { get; set; } = 100d;
 
         public string GetName()
@@ -17,22 +21,23 @@ namespace Example.Backend
             return Name;
         }
 
-        public async Task<IPage> Print(string text, bool some, CancellationToken cancellationToken = default)
+        public async Task<IPage> Print(string text, bool some, RequestContext context,
+            CancellationToken cancellationToken = default)
         {
             // throw new Exception("The method or operation is not implemented.");
             var page = new Page { Text = text };
-            OnPrint?.Invoke(page);
+            Console.WriteLine($"Request id : :{context.RequestId}");
+            OnPrint?.Invoke(page, context);
             Resource /= 1.5;
             return page;
         }
 
-        public event Action<IPage>? OnPrint;
+        public event Action<IPage, RequestContext>? OnPrint;
 
         public void Dispose()
         {
             Console.WriteLine(
                 "Dispose printer with name {0}, Dispose works, Dispose works, Dispose works, Dispose works,", Name);
         }
-        
     }
 }