Stunning forbidden keyword about QSettings

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    QSettings cfg(CONFIG_INI_PATH, QSettings::IniFormat);
    cfg.beginGroup("general"); // <-- other keywords are all ok.
    std::string val = cfg.value("itemCount").toString().toStdString();
    int video_count = cfg.value("itemCount").toInt();
    cfg.endGroup();

'general' keyword will lead 'val' to output empty in Qt5.15.2.