AC-13594: Special price is not showing correctly for Configurable product's child product (simple product)

Revert changes to use a plugin instead

Author: sumesh-GL

app/code/Magento/Catalog/Plugin/Model/ConfigPlugin.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * Copyright 2025 Adobe
+ * All Rights Reserved.
+ */
+
+namespace Magento\Catalog\Plugin\Model;
+
+use Magento\Catalog\Model\Config as Subject;
+use Magento\Catalog\Model\Product;
+use Magento\Eav\Model\Config as EavConfig;
+
+/**
+ * Plugin to ensure special_price attribute is always loaded in product listings
+ * even when used_in_product_listing = 0
+ */
+class ConfigPlugin
+{
+    private const SPECIAL_PRICE_ATTR_CODE = 'special_price';
+
+    /**
+     * @param EavConfig $eavConfig
+     */
+    public function __construct(
+        private readonly EavConfig $eavConfig
+    ) {
+    }
+
+    /**
+     * Add special_price attribute to the list of attributes used in product listing
+     * regardless of its used_in_product_listing setting
+     *
+     * @param Subject $subject
+     * @param array $result
+     * @return array
+     */
+    public function afterGetAttributesUsedInProductListing(Subject $subject, array $result): array
+    {
+        // Check if special_price is already in the result
+        if (!isset($result[self::SPECIAL_PRICE_ATTR_CODE])) {
+            // Get the special_price attribute
+            $specialPriceAttribute = $this->eavConfig->getAttribute(
+                Product::ENTITY,
+                self::SPECIAL_PRICE_ATTR_CODE
+            );
+
+            if ($specialPriceAttribute && $specialPriceAttribute->getId()) {
+                // Add it to the result
+                $result[self::SPECIAL_PRICE_ATTR_CODE] = $specialPriceAttribute;
+            }
+        }
+        return $result;
+    }
+}

app/code/Magento/Catalog/Pricing/Price/SpecialPrice.php

@@ -84,11 +84,6 @@ public function getSpecialPrice()
     {
         $specialPrice = $this->product->getSpecialPrice();
 
-        // If special_price is not loaded (null and attribute not loaded), load it from resource
-        if ($specialPrice === null && $this->product->getTypeId() === 'simple') {
-            $specialPrice = $this->getSpecialPriceFromResource();
-        }
-
         if ($specialPrice !== null && $specialPrice !== false && !$this->isPercentageDiscount()) {
             $specialPrice = $this->priceCurrency->convertAndRound($specialPrice);
         }
@@ -137,19 +132,4 @@ public function isPercentageDiscount()
         return false;
     }
 
-    /**
-     * Get special price from resource
-     *
-     * @return float|null
-     */
-    private function getSpecialPriceFromResource(): ?float
-    {
-        $resource = $this->product->getResource();
-        $specialPrice = $resource->getAttributeRawValue(
-            $this->product->getId(),
-            'special_price',
-            $this->product->getStoreId()
-        );
-        return !is_array($specialPrice) ? $specialPrice : null;
-    }
 }

app/code/Magento/Catalog/etc/frontend/di.xml

@@ -124,4 +124,7 @@
             </argument>
         </arguments>
     </type>
+    <type name="Magento\Catalog\Model\Config">
+        <plugin name="special_price_listing_plugin" type="Magento\Catalog\Plugin\Model\ConfigPlugin" sortOrder="10" />
+    </type>
 </config>