QtQuick menus: sub menus close unexpectedly when trying to access them in 'windows' style

The submenus of QtQuick menus close when hovering to them with a mouse and hence it is not possible to access the submenus. The problem doesn't occur on every access, but most of the time. This is reproducible only with 'windows' style.

The attached example demonstrates the problem. Run with -style=windows option.