showMaximized does not work when Qt::WA_ShowWithoutActivating is set

#include <QApplication>
#include <QWidget>

int main(int argc, char** argv) {
    auto app = QApplication{argc, argv};
    auto win = QWidget{};
    win.setAttribute(Qt::WA_ShowWithoutActivating);
    win.showMaximized();
    return app.exec();
}