Use MenuItems bridge interface to raise clicks.

src/Avalonia.Controls/NativeMenuBar.cs

@@ -30,7 +30,7 @@ namespace Avalonia.Controls
 
         private static void OnMenuItemClick(object sender, RoutedEventArgs e)
         {
-            (((MenuItem)sender).DataContext as NativeMenuItem)?.RaiseClick();
+            (((MenuItem)sender).DataContext as INativeMenuItemExporterEventsImplBridge)?.RaiseClicked();
         }
     }
 }

src/Avalonia.Controls/NativeMenuItem.cs

@@ -5,7 +5,7 @@ using Avalonia.Utilities;
 
 namespace Avalonia.Controls
 {
-    public class NativeMenuItem : NativeMenuItemBase
+    public class NativeMenuItem : NativeMenuItemBase, INativeMenuItemExporterEventsImplBridge
     {
         private string _header;
         private KeyGesture _gesture;
@@ -159,7 +159,7 @@ namespace Avalonia.Controls
 
         public event EventHandler Clicked;
 
-        public void RaiseClick()
+        void INativeMenuItemExporterEventsImplBridge.RaiseClicked()
         {
             Clicked?.Invoke(this, new EventArgs());
 

src/Avalonia.FreeDesktop/DBusMenuExporter.cs

@@ -319,10 +319,10 @@ namespace Avalonia.FreeDesktop
                 {
                     var item = GetMenu(id).item;
 
-                    if (item is NativeMenuItem menuItem)
+                    if (item is NativeMenuItem menuItem && item is INativeMenuItemExporterEventsImplBridge bridge)
                     {
                         if (menuItem?.IsEnabled == true)
-                            menuItem.RaiseClick();
+                            bridge?.RaiseClicked();
                     }
                 }
             }

src/Avalonia.Native/IAvnMenuItem.cs

@@ -50,7 +50,7 @@ namespace Avalonia.Native.Interop
                 return false;
             });
 
-            var callback = new MenuActionCallback(() => { item.RaiseClick(); });
+            var callback = new MenuActionCallback(() => { (item as INativeMenuItemExporterEventsImplBridge)?.RaiseClicked(); });
 
             _currentActionDisposable = Disposable.Create(() =>
             {