Android menu at action overflow button does not always open at first press

Since Qt 5.4-beta, an Android application using QtQuick.Controls with a menu shows an action bar with an overflow button. However, sometimes the overflow button opens the menu only after having been pressed twice.

I can reproduce this bug with the attached QML file that creates an ApplicationWindow with two menus and one menu item. At the first press of the overflow button, the menu opens immediately. If Item1 is selected, the menu closes. After that, the menu only opens again after two presses of the overflow button.

I used the attached QML file in a default QtQuick project created by QtCreator that comes with Qt 5.4-beta/Android with minSdkVersion=9 and targetSdkVersion=14. I verified that the bug occurs both on a smartphone with Android 4.2.2 and on a virtual device with Android 4.4.2. It also occurs in a larger project of mine, which uses minSdkVersion=9 and targetSdkVersion=10.