Android: Sub-menu does not show for widget based app compiled for arm64-v8a

The sub menu of a simple main menu is not shown if the Qt Widget Application for Android is compiled for arm64-v8a (see attached screenshots).

It works fine (the sub menu is shown, see attached screenshots) if the application is compiled for armeabi-v7a.

Workflow to reproduce the problem:

• create simple Qt Widget application
• add main menu bar
• add some main menu items
• add some sub menu items for each main menu item
• compile for android (using arm and arm64)
• install apk on android device
• start the application and try to activate a sub menu item ==> works for arm but does not work for arm64 version

The source code for the demonstration application SimpleMenu is attached. Also the apk's for arm and arm64 are attached.