Issue with GtkActionGroup inside GtkBuilder definitions

main.c

#include <gtk/gtk.h>

int
main (int     argc,
      char  **argv)
{
  GObject *object;
  GtkBuilder *builder;
  GError *err = NULL;
  
  gtk_init (&argc, &argv);
  
  builder = gtk_builder_new ();
  if (! gtk_builder_add_from_file (builder, "window.ui", &err))
    g_error ("Failed to load UI file: %s", err->message);
  gtk_builder_connect_signals (builder, NULL);
  
  object = gtk_builder_get_object (builder, "window1");
  gtk_widget_show_all (GTK_WIDGET (object));
  
  gtk_main ();
  
  return 0;
}

window.ui

<?xml version="1.0"?>
<interface>
  <requires lib="gtk+" version="2.16"/>
  <!-- interface-naming-policy project-wide -->
  <object class="GtkActionGroup" id="actiongroup1">
    <child>
      <object class="GtkAction" id="quit">
        <property name="label">_Quit</property>
        <property name="stock_id">gtk-quit</property>
        <signal name="activate" handler="gtk_main_quit"/>
      </object>
      <accelerator key="Q" modifiers="GDK_CONTROL_MASK"/>
    </child>
  </object>
  <object class="GtkWindow" id="window1">
    <signal name="destroy" handler="gtk_main_quit" />
    <child>
      <object class="GtkVBox" id="vbox1">
        <property name="visible">True</property>
        <child>
          <object class="GtkMenuBar" id="menubar1">
            <property name="visible">True</property>
            <child>
              <object class="GtkMenuItem" id="menuitem1">
                <property name="visible">True</property>
                <property name="label">_File</property>
                <property name="use_underline">True</property>
                <child type="submenu">
                  <object class="GtkMenu" id="menu1">
                    <property name="visible">True</property>
                    <child>
                      <object class="GtkImageMenuItem" id="imagemenuitem1">
                        <property name="visible">True</property>
                        <property name="related_action">quit</property>
                        <property name="use_action_appearance">True</property>
                      </object>
                    </child>
                  </object>
                </child>
              </object>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="position">0</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>