Menus stop working when app contains a QOpenGLWidget and is fullscreen

When I set the application to fullscreen*, all the menus stop working, ie pressing a QPushButton with a QMenu doesn't bring the menu up, right click contextual menu doesn't show up etc.

This only seems to happen if the widget contains a QOpenGLWidget.

I attached a test program to easily reproduce this.

*: or maximize it with the auto-hide taskbar Windows option turned on and the window flag Qt::FramelessWindowHint