Value mismatch between QJSonDocument and QString

#include <QCoreApplication>
#include <QDebug>
#include <QJsonDocument>

int main(int argc, char *argv[])

{     QCoreApplication a(argc, argv);    

 

    QString tid = "

{\"transactionId\":20230712203139768}

";
    qDebug() << "Result1: " << tid.toUtf8();
    QJsonDocument doc = QJsonDocument::fromJson(tid.toUtf8());
    qDebug() <<"Result2: "<<doc;

   

    return a.exec();
}