Qml menu with native windows styles have some render bugs
When you try to open sub menu and there are not enough space for it. Menu shadow first rendered on the right side then disappear and menu sucssesfuly rendered on the left side.
Bug is that this black part rendered.
Also there is error log for QtCreator
"/Private/ScrollViewHelper.qml:137:9: QML Binding: Property 'raised' does not exist on Item."