Qt Labs Platform FileDialog's currentFile property will not update the QFileDialog when written to externally

import QtQuick
import QtQuick.Window
import QtQuick.Controls
import QtQuick.Dialogs

Window {
    width: 640
    height: 480
    visible: true

    Button {
        anchors.centerIn: parent
        text: "Open QtQuickDialogs FileDialog"
        onClicked: dialog.open()
    }

    FileDialog {
        id: dialog
        selectedFile: "hello.txt" // Works
        fileMode: FileDialog.SaveFile
    }
}

import QtQuick
import QtQuick.Window
import QtQuick.Controls
import Qt.labs.platform

Window {
    width: 640
    height: 480
    visible: true

    Button {
        anchors.centerIn: parent
        text: "Open QtQuickDialogs FileDialog"
        onClicked: dialog.open()
    }

    FileDialog {
        id: dialog
        currentFile: "hello.txt" // Not used by the fallback QFileDialog
        fileMode: FileDialog.SaveFile
    }
}