Container should be registered with itself

src/Umbraco.Core/Composing/ContainerFactory.cs

@@ -31,6 +31,7 @@ namespace Umbraco.Core.Composing
             {
                 throw new Exception($"Container factory '${configuredTypeName}' did not return an IContainer implementation.");
             }
+
             return container;
         }
     }

src/Umbraco.Core/UmbracoApplicationBase.cs

@@ -70,6 +70,7 @@ namespace Umbraco.Core
             // create the container for the application, and configure.
             // the boot manager is responsible for registrations
             var container = GetContainer();
+            container.RegisterSingleton(x => container);
             Current.Container = container;
 
             // register the essential stuff,