Regression in Loader, does not respect anchors and fails to update the size of it's source component

Rectangle {
    width: 300
    height: 200
    color: "blue"
    Loader {  // <-- size (0, 0)
//        Rectangle { anchors.fill: parent; color: "yellow" }
        anchors.fill: parent
        anchors.margins: 10
        sourceComponent: Component {
            Rectangle { color: "red" } // <-- size (0, 0)
        }
    }
}