QML Text doesn't reset lineCount when text is empty

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    visible: true
    width: 640
    height: 480
    Text {
        id: test
        width: parent.width
        text: "qqqqqqqqqq qqqqqqqqqqqqqqqqqqqqqq qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq qqqqqqqqqqqqqqqqqqqqqqqqq qqqqqqqqqqqqqqqqqqqq"
        wrapMode: Text.WordWrap
        onLineCountChanged: {
            console.log("test: " + test.lineCount)
        }
    }
    Timer {
        interval: 5000
        running: true
        onTriggered: {
            test.text = ""
            console.log("test: " + test.lineCount)
        }
    }
}