QPushButton with stylesheet when used with WebView does not update.

page containing a QWebEngineView and buttons/parentWidget with a stylesheet in stacked widget does not always update.

Attached example reproduces it:
Click Right PushButton
Click Left PushButton
Click Right PushButton
Observe Right pushButton not in "checked" state and neither is left pushbutton.
Hovering mouse over left pushbutton updates it.

This started happening when updated to Qt5.6.2 and had to change QWebView to QWebEngineView.

This happens for QOpenGLWidget which is used by QWebEngineView