Calling sortByColumn() on a view with proxy model set resets header section settings

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QTableView tw;
    tw.show();

    QStandardItemModel md;
    md.setColumnCount(1);

    QSortFilterProxyModel proxy;
    proxy.setSourceModel(&md);
    tw.setModel(&proxy);

    tw.horizontalHeader()->setSectionResizeMode(0, QHeaderView::Fixed);

    qDebug() << tw.horizontalHeader()->sectionResizeMode(0);
    tw.sortByColumn(0);
    qDebug() << tw.horizontalHeader()->sectionResizeMode(0);

    return a.exec();
}

QHeaderView::ResizeMode(Fixed)
QHeaderView::ResizeMode(Interactive)