Black screen when activity is destroyed

Android 8. QML+Quick Controls 2 app.

1. Start app
2. Go to recent apps list (by clicking rightmost Android button) and remove app
3. Activity::onDestroyed is called, but process stays running
4. Try launch app again

Result: black screen is shown. App can't be started according to the user's point of view. App reinstall / phone restart is required to start app again.

Workaround I've found:

In the code of activity use this:

@Override
protected void onDestroy()
{
    //super.onDestroy();
    System.exit(0);
}