the behaviour of the stop signal is mismatched with the documentation

import QtQuick 2.0
Rectangle {
    width: 480
    height: 272
    state: "Init"
    Text {
        id: sampleText
        anchors.centerIn: parent
        color: "salmon"
        text: "Hello World!"
        font.pixelSize: 14
        scale: 1
        opacity: 1
    }
    states: [
        State {
            name: "Init"
            PropertyChanges {
                target: sampleText
                opacity: 0
                scale: 1
            }
        },
        State {
            name: "On"
            PropertyChanges {
                target: sampleText
                opacity: 1
                scale: 2
            }
        }
    ]
    transitions: [
        Transition {
            from: "Init"
            to: "On"
            ParallelAnimation {
                NumberAnimation {
                    property: "scale"
                    duration: 3000
                    onStopped: {
                        console.log("scale NumberAnimation stopped")
                    }
                }
                NumberAnimation {
                    property: "opacity"
                    duration: 3000
                    onStopped: {
                        console.log("opacity NumberAnimation stopped")
                    }
                }
                onStarted: console.log("ParallelAnimation started")
                onStopped: {
                    console.log("ParallelAnimation stopped")
                    sampleText.text = "ParallelAnimation stopped"
                }
            }
        }
    ]
    Component.onCompleted: {
        state = "On"
    }
}