ProductIdentitiesExtender.php

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<?php
declare(strict_types=1);

namespace Magento\ConfigurableProduct\Model\Plugin;

use Magento\ConfigurableProduct\Model\Product\Type\Configurable;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Catalog\Model\Product;

class ProductIdentitiesExtender
{
    private $configurableType;

    private $productRepository;

    public function __construct(Configurable $configurableType, ProductRepositoryInterface $productRepository)
    {
        $this->configurableType = $configurableType;
        $this->productRepository = $productRepository;
    }

    public function afterGetIdentities(Product $subject, array $identities): array
    {
        foreach ($this->configurableType->getParentIdsByChild($subject->getId()) as $parentId) {
            $parentProduct = $this->productRepository->getById($parentId);
            $identities = array_merge($identities, $parentProduct->getIdentities());
        }

        return array_unique($identities);
    }
}