QMenu makes void enterEvent(QEvent *) and void leaveEvent(QEvent *) broken

1) widget is a window and it not contained in other widgets
2) widget attribute Qt::FramelessWindowHint is true

if context menu QMenu executed and closed by left mouse button that clicked directly to parent widget
than functions void enterEvent(QEvent *) and void leaveEvent(QEvent *) become stop sending events
until QMenu executed once again and closed by clicking outside of widget.
See example in Attachment.
I use setAttribute(Qt::WA_TransparentForMouseEvents,true); directly before executing menu and this helps but I think that bug mast be fixed.