loadDefaultAdditions example

$request->request->set('navigationId', $category->getId());
        }

        $page = $this->genericLoader->load($request, $context);
        $page = ProductPage::createFrom($page);

        $page->setProduct($product);
        $page->setConfiguratorSettings($result->getConfigurator() ?? new PropertyGroupCollection());
        $page->setNavigationId($product->getId());

        if (!Feature::isActive('v6.6.0.0')) {
            $this->loadDefaultAdditions($product, $page, $request, $context);
        } elseif ($cmsPage = $product->getCmsPage()) {
            $page->setCmsPage($cmsPage);
        }

        $this->loadOptions($page);
        $this->loadMetaData($page);

        $this->eventDispatcher->dispatch(
            new ProductPageLoadedEvent($page, $context, $request)
        );