QWindow in a container prevents QMdiSubWindow close

It appears that the Qt Event Loop stops processing close events when a QSurface3DSeries is put into a QMdiSubWindow.

The attached zip contains the Qt DataVisualization 3D Surface example with the following minor tweaks:

• A QMdiArea is set as the central widget of a QMainWindow
• The Q3DSurface container widget is inserted into a QMdiSubWindow

As you will see, the sub-window cannot be closed with the Q3DSurface present. The sub-window will close normally if you substitute for another widget such as a QLabel.

This seems like a Qt 6.2 regression. It is not present in Qt 5.15.

Also worth noting, in another project that is not attached; Calls to QApplication::quit() are ignored when the Q3DSurface container widget is inserted into a QMdiSubWindow.