Inconsistent rendering of underlines between QPainter and QtQuick text items

I've notice that there is an inconsistency between the behavior of the underline position in a text rendered using QPainter and text rendered in Qt Quick.

For example, in the picture below the left text is rendered using QPainter (in a QQuickPaintedItem) and the right text is rendered using Text from QtQuick

As you can see on the left hand side the underline is much closer to the baseline, while there is a noticeable gap on the right.

The code I've used for the LHS is:

    painter->setRenderHint(QPainter::Antialiasing);

    QFont font {"Arial", 50};
    font.setUnderline(true);

    QPointF pos (100, 60);
    painter->setFont(font);
    painter->drawText(pos, "hello");

While the RHS is rendered using:

        Text{
            text: "hello"
            font.family: "Arial"
            font.underline: true
            font.pointSize: 50
            renderType: Text.QtRendering
        }

I would've expected the two rendering systems to behave similarly as I thought QtQuick was using QFontMetricsF internally.