Minimal example of issue where Qt labs Menu element gets an extra "AutoFill" submenu if it's in the same window as a TextField

quick_labs_menu_autofill.qml

import QtQuick
import QtQuick.Controls
import Qt.labs.platform as Labs

ApplicationWindow {
    id: root
    width: 640
    height: 64
    visible: true
    Rectangle {
        Column {
            TextField {
                id: textfield
                height: 24
                text: ""
                placeholderText: "Type to search tools"
                font.pixelSize: 18
                focus: true
                background: Rectangle {
                    color: "transparent"
                }
                Keys.onEscapePressed: {
                    root.close()
                }
                onAccepted: {
                    print("Selected")
                    root.close()
                }
            }
            Row {
                id: toolbar
                Button {
                    id: menuButton
                    text: "Menu"
                    onClicked: {
                        testMenu.open(menuButton)
                    }
                }
                Labs.Menu {
                    id: testMenu
                    Labs.MenuItem {
                        text: qsTr("First")
                        shortcut: StandardKey.ZoomIn
                    }
                    Labs.MenuItem {
                        text: qsTr("Second")
                        shortcut: StandardKey.ZoomOut
                    }
                    Labs.Menu {
                        title: "Submenu"
                        Labs.MenuItem {
                            text: qsTr("Subitem 1")
                            shortcut: StandardKey.ZoomOut
                        }
                        Labs.MenuItem {
                            text: qsTr("Subitem 2")
                            shortcut: StandardKey.ZoomOut
                        }
                    }
                }
            }
        }
    }
}