Nested popups cause Keys.onBackPressed event handler to not be executed

import QtQuick 2.9
import QtQuick.Controls 2.2
import QtQuick.Dialogs 1.2

ApplicationWindow {
  id: root;
  visible: true
  width:400;
  height:200;
  
  StackView {
    id: stack_view;
    Component.onCompleted: {
      push(_HomeComponent)
    }
    Keys.onBackPressed: {
      console.log('BackPressed intercepted and stopped from quitting the program.');
    }
  }
  
  Component {
    id: _HomeComponent;
    Item {
      Button {
        text: 'open popup';
        onClicked: { 
          popup.visible = true;
          console.log('open popup clicked');
        }
      }
      Popup {
        id: popup
        visible: false;
        parent: ApplicationWindow.contentItem;
        Component {
          id: _PopupContent;
          Rectangle {
            color: 'grey';
            width: 150;
            height: 150;
            Button {
              text: 'open nested popup';
              onClicked: { 
                nested_popup.visible = true;
                console.log('open nested popup clicked');
              }
            }
            Popup {
              id: nested_popup
              visible: false;
              parent: ApplicationWindow.contentItem;
              Component {
                id: _NestedPopupContent;
                Rectangle {
                  color: 'red';
                  width: 150;
                  height: 150;
                  Text {text: 'In nested popup'}
                }
              }
              
              Loader {
                sourceComponent: nested_popup.visible ? _NestedPopupContent : null;
              }
            }
          }
        }
        Loader {
          sourceComponent: popup.visible ? _PopupContent : null;
        }
      }
    }
  }
}