QtCreator underscores assigning of composite properties

Item {
    id: root
    property font ourFont
    Text {
        font: root.ourFont
    }
}

SomeComponent {
    ourFont.pixelSize: 24 // QtCreator underscores this line with error: "ourFont" does not have members (M17)
}

SomeComponent {
    ourFont {
        pixelSize: 24 // not underscored
    }
}