Icon alignment on QTabWidget - I believe it's supposed to be centered

If I set an 8x8 pixel icon on a tab in a QTabWidget via QTabWidget::setTabIcon(), it is drawn top left. There doesn't seem to be a way to change this, and I traced the code right through to
QCommonStyle::drawControl and then QCommonStylePrivate::tabLayout where it has the code:
*iconRect = QRect(tr.left(), tr.center().y() - tabIconSize.height() / 2,
tabIconSize.width(), tabIconSize .height());

Which I believe is trying to draw the icon centered within tr. So I am raising a ticket as I believe that the intention was that it is center aligned but for some reason that is not what's happening.

This is easily re-creatable using just designer. Create a form, drop on a QTabWidget, put an 8x8 icon on a tab and you'll see it doesn't line up. This seems like it should be configurable from somewhere.