QPainter::drawLine() for multiple times, some lines have incorrect width.

run QPainter::drawLine() on QWidget for multiple times, we set the pen width to 1, but some lines have the width 2.

This problem only exists in Qt 6 version, I tested it with Qt 5.15.2, no such problem.

test code:

void QWidgetMain::paintEvent(QPaintEvent*)
{
    QPainter Painter(this);
    
    QPen MyPen;
    MyPen.setColor(QColor(250, 20, 20));
    MyPen.setWidth(1);
    Painter.setPen(MyPen);

    for (int i = 0; i < width(); i += 3)
   

{         Painter.drawLine(i, 50, i, 200);     }

    for (int i = 250; i < 400; i += 3)
   

{         Painter.drawLine(50, i, 200, i);     }

}

Test result was uploaded to attachment.