Custom DialogButtonBox buttons go outside Dialog with macOS style

import QtQuick
import QtQuick.Controls

ApplicationWindow {
    width: 640
    height: 480
    visible: true
    title: "quick"

    Dialog {
        id: root
        objectName: "opacityDialog"
        title: qsTr("Opacity")
        modal: true
        dim: false
        focus: true
        visible: true
        width: 400
        // Works
//        standardButtons: Dialog.Ok | Dialog.Cancel

        // Buttons go past right side of dialog
        footer: DialogButtonBox {

            Button {
                objectName: "opacityDialogOkButton"
                text: qsTr("OK")

                DialogButtonBox.buttonRole: DialogButtonBox.AcceptRole
            }
            Button {
                objectName: "opacityDialogCancelButton"
                text: qsTr("Cancel")

                DialogButtonBox.buttonRole: DialogButtonBox.RejectRole
            }
        }
    }
}