FontLoader - swapping between name and source does not behave correctly

//
import QtQuick 2.0

Item {
    id: fontloaderelementtest
    height: 640; width: 360
    property string testtext: ""
    property int statenum: 1
    property int currentfont: 0
    property variant availablefonts
    Component.onCompleted: { availablefonts = Qt.fontFamilies(); }

    Rectangle { anchors.fill: textitem; color: "lightsteelblue"; radius: 5 }
    FontLoader { id: fontloaderelement; name: availablefonts[currentfont]
        onStatusChanged: {
            console.log("State: ",statenum,"\nStatus: ",status,"\nFontname: ",name,"\nFontsource: ",source,"\nUsing font: ",availablefonts[currentfont]);
            switch(status) {
            case FontLoader.Null: loaderstatus.text = "Null"; break;
            case FontLoader.Ready: loaderstatus.text = "Ready"; break;
            case FontLoader.Loading: loaderstatus.text = "Loading"; break;
            case FontLoader.Error: loaderstatus.text = "Error"; break;
            default: loaderstatus.text = "No idea"; break;
            }
        }
    }

    Text { id: textitem; text: fontloaderelement.name; font: fontloaderelement.name
        horizontalAlignment: Text.AlignHCenter; verticalAlignment: Text.AlignVCenter; height: 100; width: 250; anchors.centerIn: parent;
    }

    Text { id: loaderstatus; text: ""; font: fontloaderelement.name
        horizontalAlignment: Text.AlignHCenter; verticalAlignment: Text.AlignVCenter; height: 50; width: parent.width; anchors.top: textitem.bottom;
    }

    MouseArea { anchors.fill: parent; onClicked: { advance(); } }
    states: [
        // Use the first available font
        State { name: "start"; when: statenum == 1 },
        // Use the second available font
        State { name: "changefont"; when: statenum == 2
            PropertyChanges { target: fontloaderelementtest; currentfont: 1 }
        },
        // Use a locally stored font
        State { name: "source"; when: statenum == 3
            PropertyChanges { target: fontloaderelement; source: "NeonLights.ttf" }                         // 1. Don't change name property
            //PropertyChanges { target: fontloaderelement; source: "NeonLights.ttf"; name: "Neon Lights" }  // 2. Changed within state, should reset
            //PropertyChanges { target: fontloaderelement; name: undefined; source: "NeonLights.ttf" }      // 3. Unset name
        }
    ]

    function advance() {
        statenum = statenum == states.length ? 1 : statenum+1;
    }
}