If you place a widget with the Qt::WA_NativeWindow attribute onto a window with the Qt::FramelessWindowHint window flag set, the other widgets on the window will no longer update when modified.

The issue can also be reproduced by setting the Qt::AA_NativeWindows on the application and using a window with the Qt::FramelessWindowHint window flag set.

There are a number of widgets, like the QGlWidget, that require the Qt::WA_NativeWindow flag be set. These controls also cause the issue on borderless windows.