WASM - Tumbler does not work good/at all

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Tumbler example")

    Row{
        anchors.centerIn: parent
        Tumbler{
            model: 24
        }
        Tumbler{
            model: 60
        }
    }
}