MenuItem with checkable property set to true will always display as checked regardless the actual checked property.

See the following code for the issue: (Material theme)

import QtQuick 2.7
import QtQuick.Controls 2.3

ApplicationWindow {
    menuBar: MenuBar {
        Menu {
            title: "Test"
            MenuItem {
                checkable: true
                checked: false
                text: "Simply Wrong"
            }
        }
    }
}

It appears the CheckIndicator now using control.checkState property for testing whether it should display check mark, but unfortunately MenuItem does not have checkState property, thus the wrong appearance.