How to change the bar line type of a measure

I guess there is some kind of bug here.

In a new measure added by the API no BAR_LINE element can be found at its end by the API.

The code is basically this one:

var measure = cursor.measure;
var segment = measure.lastSegment;
var element = segment.elementAt(cursor.track);

if (element.type == Element.BAR_LINE) {
    score.startCmd();
    console.log("--BAR LINE--");
    element.barlineType = 32;
    score.endCmd();
} else {
    console.log("--NOT BAR LINE--");

}

It is working in an existing score.

For score created by the API, I've made 4 scenarios, all based on the creation of a score with one measure.

Scenario 1: Don't add any other measure, search for a bar line in the default first measure
==> OK

Scenario 2: Add a new measure at the end of the score, search for a bar line in the default first measure
==> OK

Scenario 3: Add a new measure at the end of the score, search for a bar line in the new measure
==> KO. Last element found is a Rest

Scenario 4: Add atwo new measures at the end of the score, search for a bar line in the middle measure (so in an API created one)
==> KO. Last element found is a Rest

import QtQuick 2.0
import MuseScore 3.0

MuseScore {
    version: "3.0"
    description: "This demo plugin creates a new score."
    menuPath: "Plugins.createscore"
    requiresScore: false

    onRun: {
        console.log("hello createscore");
        var score = newScore("Test-Score", "piano", 1);

        var cursor = score.newCursor();
        cursor.track = 0;

        // Scenario 1 + 2 + 3 + 4
        cursor.rewind(0);

        // Scenario 2 + 3 + 4
        score.appendMeasures(1);
        cursor.rewind(0);
        // Scenrio 3 + 4 
        cursor.nextMeasure();

        // Scenario 4
        score.appendMeasures(1);

        // All scenario  
        cursor.setDuration(1, 4);
        cursor.addNote(60);

        var measure = cursor.measure;
        var segment = measure.lastSegment;
        var element = segment.elementAt(cursor.track);

        if (element.type == Element.BAR_LINE) {
            score.startCmd();
            console.log("--BAR LINE--");
            element.barlineType = 32;
            score.endCmd();
        } else {
            console.log("--NOT BAR LINE-- ("+element.userName()+")");

        }

        Qt.quit();
    }
}

PS: other ways to get to the last segment have not worked either, such as looping from cursor.segmentwith next() and nextInMeasure(), ...