AddDelegate produces a MissingMethodException about spectre.console HOT 5 CLOSED

...

var app = new CommandApp();
app.Configure(cfg => {
  cfg.AddBranch("demo", d => {
    d.AddDelegate<EmptyCommandSettings>("delegate", ctx => {
      AnsiConsole.MarkupLine("[red]This doesn't work[/]");
      return 0;
    });
  });
});

...

app.Run(args);

 app.Configure(cfg =>
        {
            cfg.AddDelegate("a", _ =>
            {
                AnsiConsole.MarkupLine("[red]Complete[/]");
                return 0;
            });
        });

app.Configure(cfg =>
        {
            cfg.AddBranch("a", d =>
            {
                d.AddDelegate("b", _ =>
                {
                    AnsiConsole.MarkupLine("[red]Complete[/]");
                    return 0;
                });
            });
        });

@@ -324,11 +324,16 @@
     /// <param name="func">The delegate to execute as part of command execution.</param>
     /// <returns>A command configurator that can be used to configure the command further.</returns>
     public static ICommandConfigurator AddDelegate<TSettings>(
-        this IConfigurator<TSettings> configurator,
+        this IConfigurator<TSettings>? configurator,
         string name,
         Func<CommandContext, int> func)
-            where TSettings : CommandSettings
+        where TSettings : CommandSettings
     {
+        if (typeof(TSettings).IsAbstract)
+        {
+            AddDelegate(configurator as IConfigurator<EmptyCommandSettings>, name, func);
+        }
+
         if (configurator == null)
         {
             throw new ArgumentNullException(nameof(configurator));