Parameter $requiredAttributeIds of getUsedProducts() on configurable product type is not used, custom attribute loading does not work

[sippsolutions]

Preconditions (*)

1. Magento Version 2.3.2

Steps to reproduce (*)

1. Try to load custom attribute's value from \Magento\ConfigurableProduct\Model\Product\Type\Configurable::getUsedProducts()
   Parameters are $product, $requiredAttributeIds

Expected result (*)

1. The attributes in $requiredAttributeIds get loaded and their values are accessible after loading

Actual result (*)

1. You only have to look at the code to know the parameter does not get used for loading, it just gets used for the cache key!

    /**
     * Returns array of sub-products for specified configurable product
     *
     * $requiredAttributeIds - one dimensional array, if provided
     *
     * Result array contains all children for specified configurable product
     *
     * @param  \Magento\Catalog\Model\Product $product
     * @param  array $requiredAttributeIds
     * @return ProductInterface[]
     */
    public function getUsedProducts($product, $requiredAttributeIds = null)
    {
        $metadata = $this->getMetadataPool()->getMetadata(ProductInterface::class);
        $keyParts = [
            __METHOD__,
            $product->getData($metadata->getLinkField()),
            $product->getStoreId(),
            $this->getCustomerSession()->getCustomerGroupId()
        ];
        if ($requiredAttributeIds !== null) {
            sort($requiredAttributeIds);
            $keyParts[] = implode('', $requiredAttributeIds);
        }
        $cacheKey = $this->getUsedProductsCacheKey($keyParts);
        return $this->loadUsedProducts($product, $cacheKey);
    }

[m2-assistant]

Hi @sippsolutions. Thank you for your report.
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[magento-engcom-team]

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[magento-engcom-team]

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[m2-assistant]

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[magento-engcom-team]

✅ Confirmed by @engcom-Charlie
Thank you for verifying the issue. Based on the provided information internal tickets MC-20142 were created

Issue Available: @engcom-Charlie, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.