QStyle::subControlRect() returns wrong results for vertical slider groove

#include <QApplication>
#include <QDebug>
#include <QSlider>
#include <QStyleOptionSlider>
#include <QVBoxLayout>

class PaintEventCenteredSlider : public QSlider
{
public:
    PaintEventCenteredSlider(QWidget *parent = nullptr) : QSlider(parent) {}

protected:
    void paintEvent(QPaintEvent *event) override
    {
        QStyleOptionSlider option;
        option.initFrom(this);
        // Groove rect information
        const auto grooveRect = style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderGroove, this);
        qDebug() << "Orientation:" << orientation() << "Rect:" << grooveRect;

        QSlider::paintEvent(event);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    // Create a horizontal and a vertical slider
    auto* const paintEventSliderHorizontal = new PaintEventCenteredSlider;
    paintEventSliderHorizontal->setOrientation(Qt::Horizontal);
    auto* const paintEventSliderVertical = new PaintEventCenteredSlider;
    paintEventSliderVertical->setOrientation(Qt::Vertical);

    // Apply to layout and then widget
    auto* const layout = new QVBoxLayout;
    layout->addWidget(paintEventSliderHorizontal);
    layout->addWidget(paintEventSliderVertical);
    auto* const widget = new QWidget;
    widget->setLayout(layout);
    widget->show();

    return a.exec();
}

cmake_minimum_required(VERSION 3.8)

set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

project(ExampleProject LANGUAGES CXX)

find_package(QT NAMES Qt6 COMPONENTS Widgets REQUIRED)
find_package(Qt6 COMPONENTS Widgets REQUIRED)

add_executable(ExampleProject
    ${CMAKE_CURRENT_LIST_DIR}/main.cpp
)
target_link_libraries(ExampleProject
    PRIVATE Qt::Widgets
)