Reg->6: macOS: FileDialog opens in the wrong directory when two FileDialog instances are in use

This is a regression experienced when upgrading Qt from 5.15 to 6.2.2.

In my application, I have two FileDialogs. One for picking file type A (e.g. documents), one for picking file type B (e.g. pictures).

The code looks as follows:

import QtQuick
import QtQuick.Controls.Basic
import QtQuick.Dialogs
import QtCore

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    FileDialog {
        id: documentsDialog
        currentFolder: StandardPaths.writableLocation(StandardPaths.DocumentsLocation)
    }

    Button {
        id: documentsButton
        text: qsTr("Open documents")
        onClicked: documentsDialog.open()
    }

    FileDialog {
        id: picturesDialog
        currentFolder: StandardPaths.writableLocation(StandardPaths.PicturesLocation)
    }

    Button {
        id: picturesButton
        text: qsTr("Open pictures")
        onClicked: picturesDialog.open()

        anchors.top: documentsButton.bottom
        anchors.topMargin: 16
    }
}

When I click the buttons to open the respective dialogs, Qt doesn't always open the FileDialogs at the correct paths specified via the currentFolder properties.

Reproduction:

1. Click "Open documents" → Dialog opens in Documents folder
2. Click "Open pictures" → Dialog opens in Pictures folder
3. Click "Open documents" → Dialog opens in Documents or Pictures folder, depending on your luck
4. Click "Open pictures" → Dialog opens in Documents folder (no luck involved)
5. Click "Open documents" → Dialog opens in Pictures folder
6. Click "Open documents" → Dialog opens in Documents folder
7. Click "Open pictures" → Dialog opens in Documents folder
8. Click "Open pictures" → Dialog opens in Pictures folder

As you can see, at some point the file picker always lags one step behind.

I haven't tested this on any other platform than macOS.

This didn't happen when using the Qt 5.15 FileDialog.

Workaround

Wrap each FileDialog in a Loader, load them when necessary and unload them afterwards.