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

Fixed special price display when used_in_product_listing is disabled

Added lazy loading for special price attributes and integration test coverage

Author: sumesh-GL

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

@@ -83,8 +83,20 @@ public function getValue()
     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) {
+            $resource = $this->product->getResource();
+            $specialPrice = $resource->getAttributeRawValue(
+                $this->product->getId(),
+                'special_price',
+                $this->product->getStoreId()
+            );
+        }
+
         if ($specialPrice !== null && $specialPrice !== false && !$this->isPercentageDiscount()) {
             $specialPrice = $this->priceCurrency->convertAndRound($specialPrice);
+            $this->product->setData('special_price', $specialPrice);
         }
         return $specialPrice;
     }

dev/tests/integration/testsuite/Magento/Catalog/Pricing/Price/SpecialPriceTest.php

@@ -0,0 +1,99 @@
+<?php
+/**
+ * Copyright 2025 Adobe
+ * All Rights Reserved.
+ */
+declare(strict_types=1);
+
+namespace Magento\Catalog\Pricing\Price;
+
+use Magento\Catalog\Model\Product;
+use Magento\Catalog\Model\ResourceModel\Product\Collection;
+use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
+use Magento\Catalog\Test\Fixture\Product as ProductFixture;
+use Magento\Framework\Pricing\PriceInfo\Base as PriceInfo;
+use Magento\TestFramework\Fixture\DataFixture;
+use Magento\TestFramework\Fixture\DbIsolation;
+use Magento\TestFramework\Helper\Bootstrap;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Integration test for SpecialPrice pricing class
+ */
+#[
+    DbIsolation(true)
+]
+class SpecialPriceTest extends TestCase
+{
+    /**
+     * @var \Magento\Framework\ObjectManagerInterface
+     */
+    private $objectManager;
+
+    /**
+     * @var CollectionFactory
+     */
+    private $productCollectionFactory;
+
+    /**
+     * Set up
+     */
+    protected function setUp(): void
+    {
+        $this->objectManager = Bootstrap::getObjectManager();
+        $this->productCollectionFactory = $this->objectManager->get(CollectionFactory::class);
+    }
+
+    /**
+     * Test that special price is loaded from database when attribute is not in product collection
+     *
+     * This tests the fix for the issue where special_price doesn't display when
+     * the attribute has "Used in Product Listing = No" setting
+     *
+     * @return void
+     */
+    #[
+        DataFixture(
+            ProductFixture::class,
+            ['sku' => 'simple-special-price', 'price' => 100, 'special_price' => 90]
+        ),
+    ]
+    public function testGetSpecialPriceLoadsFromDatabaseWhenNotInCollection(): void
+    {
+
+        // Load product in a collection WITHOUT special_price attribute
+        /** @var Collection $collection */
+        $collection = $this->productCollectionFactory->create();
+        $collection->addFieldToFilter('sku', 'simple-special-price')
+            ->addAttributeToSelect(['name', 'price']) // Intentionally exclude special_price
+            ->load();
+
+        /** @var Product $product */
+        $product = $collection->getFirstItem();
+
+        // Verify special_price is not loaded in the product data
+        $this->assertFalse(
+            $product->hasData('special_price'),
+            'Special price should not be loaded in product collection'
+        );
+
+        // Get the SpecialPrice pricing object
+        /** @var PriceInfo $priceInfo */
+        $priceInfo = $product->getPriceInfo();
+        /** @var SpecialPrice $specialPriceObject */
+        $specialPriceObject = $priceInfo->getPrice(SpecialPrice::PRICE_CODE);
+
+        // Call getSpecialPrice() - it should load from database
+        $specialPrice = $specialPriceObject->getSpecialPrice();
+
+        // Assert special price was loaded correctly
+        $this->assertNotNull($specialPrice, 'Special price should be loaded from database');
+        $this->assertEquals(90, $specialPrice, 'Special price should match the saved value');
+
+        // Verify the attribute is now cached in product data
+        $this->assertTrue(
+            $product->hasData('special_price'),
+            'Special price should be cached in product after loading'
+        );
+    }
+}