Rest API Magento 2.4 order update overwrites existing item information

app/code/Magento/Sales/Model/Order/ItemRepository.php

@@ -167,17 +167,31 @@ public function deleteById($id)
     public function save(OrderItemInterface $entity)
     {
         if ($entity->getProductOption()) {
-            $request = $this->getBuyRequest($entity);
-            $productOptions = $entity->getProductOptions();
-            $productOptions['info_buyRequest'] = $request->toArray();
-            $entity->setProductOptions($productOptions);
+            $entity->setProductOptions($this->getItemProductOptions($entity));
         }
 
         $this->metadata->getMapper()->save($entity);
         $this->registry[$entity->getEntityId()] = $entity;
         return $this->registry[$entity->getEntityId()];
     }
 
+    /**
+     * Return product options
+     *
+     * @param OrderItemInterface $entity
+     * @return array
+     */
+    private function getItemProductOptions(OrderItemInterface $entity): array
+    {
+        $request = $this->getBuyRequest($entity);
+        $productOptions = $entity->getProductOptions();
+        $productOptions['info_buyRequest'] = $productOptions && !empty($productOptions['info_buyRequest'])
+            ? array_merge($productOptions['info_buyRequest'], $request->toArray())
+            : $request->toArray();
+
+        return $productOptions;
+    }
+
     /**
      * Set parent item.
      *

dev/tests/api-functional/testsuite/Magento/Sales/Service/V1/OrderHoldTest.php

@@ -4,36 +4,94 @@
  * See COPYING.txt for license details.
  */
 
+declare(strict_types=1);
+
 namespace Magento\Sales\Service\V1;
 
+use Magento\Framework\ObjectManagerInterface;
+use Magento\Framework\Webapi\Rest\Request;
+use Magento\Sales\Api\Data\OrderInterface;
+use Magento\Sales\Api\OrderRepositoryInterface;
+use Magento\Sales\Model\Order;
+use Magento\TestFramework\Helper\Bootstrap;
 use Magento\TestFramework\TestCase\WebapiAbstract;
 
+/**
+ * Test for hold order.
+ */
 class OrderHoldTest extends WebapiAbstract
 {
-    const SERVICE_VERSION = 'V1';
+    private const SERVICE_VERSION = 'V1';
 
-    const SERVICE_NAME = 'salesOrderManagementV1';
+    private const SERVICE_NAME = 'salesOrderManagementV1';
+
+    /**
+     * @var ObjectManagerInterface
+     */
+    private $objectManager;
+
+    /**
+     * @var OrderRepositoryInterface
+     */
+    private $orderRepository;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp(): void
+    {
+        $this->objectManager = Bootstrap::getObjectManager();
+        $this->orderRepository = $this->objectManager->get(OrderRepositoryInterface::class);
+    }
 
     /**
-     * @magentoApiDataFixture Magento/Sales/_files/order.php
+     * Test hold order and check order items product options after.
+     *
+     * @magentoApiDataFixture Magento/Sales/_files/order_with_two_configurable_variations.php
+     *
+     * @return void
      */
-    public function testOrderHold()
+    public function testOrderHold(): void
     {
-        $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
-        $order = $objectManager->get(\Magento\Sales\Model\Order::class)->loadByIncrementId('100000001');
+        $order = $this->objectManager->get(Order::class)
+            ->loadByIncrementId('100000001');
+        $orderId = $order->getId();
+        $orderItemsProductOptions = $this->getOrderItemsProductOptions($order);
+
         $serviceInfo = [
             'rest' => [
-                'resourcePath' => '/V1/orders/' . $order->getId() . '/hold',
-                'httpMethod' => \Magento\Framework\Webapi\Rest\Request::HTTP_METHOD_POST,
+                'resourcePath' => '/V1/orders/' . $orderId . '/hold',
+                'httpMethod' => Request::HTTP_METHOD_POST,
             ],
             'soap' => [
                 'service' => self::SERVICE_NAME,
                 'serviceVersion' => self::SERVICE_VERSION,
                 'operation' => self::SERVICE_NAME . 'hold',
             ],
         ];
-        $requestData = ['id' => $order->getId()];
+        $requestData = ['id' => $orderId];
         $result = $this->_webApiCall($serviceInfo, $requestData);
         $this->assertTrue($result);
+
+        $this->assertEquals(
+            $orderItemsProductOptions,
+            $this->getOrderItemsProductOptions($this->orderRepository->get($orderId))
+        );
+    }
+
+    /**
+     * Return order items product options
+     *
+     * @param OrderInterface $order
+     * @return array
+     */
+    private function getOrderItemsProductOptions(OrderInterface $order): array
+    {
+        $result = [];
+        foreach ($order->getItems() as $orderItem) {
+            $result[] = $orderItem->getProductOptions();
+        }
+
+        return $result;
     }
 }