RowLayout lays out dynamically created items in the wrong order

import QtQuick 2.3
import QtQuick.Layouts 1.1

Rectangle {
  color: "black"
  width: 500

    RowLayout {
        anchors.fill: parent
        spacing: 10
        Repeater {
            id: repeater
            model: 5

            Rectangle {
                color: "red"
                width: 20
                height: 20
            }
        }

        Item {
            Layout.fillWidth: true
        }
    }

    Timer {
        running: true
        interval: 3000
        repeat: false

        onTriggered: {
            repeater.model = 6;
        }
    }
}