MC-35484: Bundle relations is remmoved when prodcuts are re-imported

Author: tsviklinskyi

app/code/Magento/BundleImportExport/Model/Import/Product/Type/Bundle.php

@@ -1,11 +1,10 @@
 <?php
-
 /**
- * Import entity of bundle product type
- *
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\BundleImportExport\Model\Import\Product\Type;
 
 use Magento\Catalog\Model\ResourceModel\Product\Attribute\CollectionFactory as AttributeCollectionFactory;
@@ -19,13 +18,15 @@
 use Magento\Store\Model\StoreManagerInterface;
 
 /**
- * Class Bundle
+ * Import entity of bundle product type
  *
- * @package Magento\BundleImportExport\Model\Import\Product\Type
  * @SuppressWarnings(PHPMD.ExcessiveClassComplexity)
  */
 class Bundle extends \Magento\CatalogImportExport\Model\Import\Product\Type\AbstractType
 {
+    /**
+     * phpcs:disable Magento2.Commenting.ConstantsPHPDocFormatting
+     */
 
     /**
      * Delimiter before product option value.
@@ -62,6 +63,10 @@ class Bundle extends \Magento\CatalogImportExport\Model\Import\Product\Type\Abst
      */
     const SELECTION_PRICE_TYPE_PERCENT = 1;
 
+    /**
+     * phpcs:enable Magento2.Commenting.ConstantsPHPDocFormatting
+     */
+
     /**
      * Array of cached options.
      *
@@ -616,6 +621,7 @@ protected function populateInsertOptionValues(array $optionIds): array
                     if ($assoc['position'] == $this->_cachedOptions[$entityId][$key]['index']
                         && $assoc['parent_id'] == $entityId) {
                         $option['parent_id'] = $entityId;
+                        //phpcs:ignore Magento2.Performance.ForeachArrayMerge
                         $optionValues = array_merge(
                             $optionValues,
                             $this->populateOptionValueTemplate($option, $optionId)
@@ -675,10 +681,7 @@ private function insertParentChildRelations()
             $childIds = [];
             foreach ($options as $option) {
                 foreach ($option['selections'] as $selection) {
-                    if (!isset($selection['parent_product_id'])) {
-                        if (!isset($this->_cachedSkuToProducts[$selection['sku']])) {
-                            continue;
-                        }
+                    if (isset($this->_cachedSkuToProducts[$selection['sku']])) {
                         $childIds[] = $this->_cachedSkuToProducts[$selection['sku']];
                     }
                 }
@@ -717,6 +720,8 @@ protected function _initAttributes()
                 }
             }
         }
+
+        return $this;
     }
 
     /**