Catalog Products List widget - prices are loaded from wrong source

[snowcore]

Preconditions (*)

1. Magento 2.2.7 (2.3) - both Open Source and Commerce editions
2. Flat catalog enabled

Steps to reproduce (*)

Create widget "Catalog Products List", add some random products to it.

Expected result (*)

Product prices are loaded from price index table catalog_product_index_price

Actual result (*)

In the resulting product collection prices are taken from flat table instead of price index table (or from EAV if flat catalog is disabled).

Technical details

This affects Magento\CatalogWidget\Block\Product\ProductsList block and some others.
The problem is in \Magento\Catalog\Block\Product\AbstractProduct::_addProductAttributesAndPrices() method.
addAttributeToSelect() method is called later than addFinalPrice() and it overrides price column

protected function _addProductAttributesAndPrices(
        \Magento\Catalog\Model\ResourceModel\Product\Collection $collection
    ) {
        return $collection
            ->addMinimalPrice()
            ->addFinalPrice()
            ->addTaxPercents()
            ->addAttributeToSelect($this->_catalogConfig->getProductAttributes())
            ->addUrlRewrite();
    }

\Magento\Catalog\Model\ResourceModel\Product\Collection::_productLimitationPrice() already handles price override, but it is not called in the right order.

// Preventing overriding price loaded from EAV because we want to use the one from index
$this->removeAttributeToSelect('price');

Other notes

1. There is no need to call both addMinimalPrice() and addFinalPrice(), as they call the same method addPriceData()
2. Potentially, the same problem is in \Magento\AdvancedCheckout\Helper\Data::getFailedItems()
3. Ideally, there should be no dependency on methods call order (or we can combine addAttributeToSelect() with addFinalPrice() in some new method).

P.S.: will submit PR a bit later.

[magento-engcom-team]

Hi @snowcore. Thank you for your report.
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@magento-engcom-team give me 2.3-develop instance - upcoming 2.3.x release

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@snowcore do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[m2-assistant]

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[magento-engcom-team]

✅ Confirmed by @engcom-Delta
Thank you for verifying the issue. Based on the provided information internal tickets MC-18667 were created

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[engcom-Bravo]

Hi @snowcore,

Thanks for your reporting and collaboration.

As per this document https://experienceleague.adobe.com/en/docs/commerce-admin/catalog/catalog/catalog-flat Use of a flat catalog is no longer recommended as a best practice.

Hence we are closing this issue.

Thanks.