QML ApplicationWindow titlebar does not respect Windows dark mode setting

There is a difference in behavior between QML Window and QML ApplicationWindow. While the Window correctly paints the titlebar light/dark according to Windows dark mode setting, the ApplicationWindow always uses the light titlebar.

See the attached MWE which demonstrates the differences.

If this is expected behavior, how would I get the QML ApplicationWindow to also use the light/dark mode setting?

Steps to reproduce:
1) Start the MWE
2) Toggle dark mode setting in Windows preferences
3) The QML Window instance correctly adapts to the setting light/dark
4) The QML ApplicationWindow always stays light