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### Issue Details

* **Electron Version:**
  * 12.0.0-beta.1 to 12.0.0-beta.6
* **Operating System:**
  * Windows 10 (2004) 
* **Last Known Working Electron version:**
  * 11.x.x (all of them)

### Expected Behavior
Click on Menu Item opens the submenu of this item

### Actual Behavior
Clicking on menu set with Menu.setApplicationMenu(Menu.buildFromTemplate(topLevelItems)); is not possible. Pressing "ALT" Highlights the menu but nothing more happens

### To Reproduce
Build Application with menu
shell/browser/ui/views/menu_bar.h
public electron::MenuDelegate::Observer {
 public:
  static const char kViewClassName[];
  explicit MenuBar(RootView* window);
  ~MenuBar() override;
  
  void SetMenu(ElectronMenuModel* menu_model);
  
  void SetAcceleratorVisibility(bool visible);
  
  bool HasAccelerator(base::char16 key);
  
  void ActivateAccelerator(base::char16 key);
  
  int GetItemCount() const;
  
  bool GetMenuButtonFromScreenPoint(const gfx::Point& point,
                                    ElectronMenuModel** menu_model,
                                    views::MenuButton** button);