QGraphicsEllipseItem::boundingRect gives a wrong answer if QPenPrivate::cosmetic is 1

auto pen = QPen{{{ 93, 109, 194}}, 5};
pen.setCosmetic(true);
auto c = new QGraphicsEllipseItem{{-0.2, -0.2, 0.4, 0.4}};
c->setPen(pen);
auto boundingRect = c->boundingRect();
printf(
    "boundingRect = {.x = %lg, .y = %lg, .width = %lg, .height = %lg }\n",
    boundingRect.x(), boundingRect.y(),
    boundingRect.width(), boundingRect.height());