MC-18702: Error when viewing CMS page grid with restricted user account

Author: dhorytskyi

app/code/Magento/Cms/Model/ResourceModel/Page/Collection.php

@@ -74,7 +74,9 @@ public function addStoreFilter($store, $withAdmin = true)
     {
         if (!$this->getFlag('store_filter_added')) {
             $this->performAddStoreFilter($store, $withAdmin);
+            $this->setFlag('store_filter_added', true);
         }
+
         return $this;
     }
 

dev/tests/integration/testsuite/Magento/Cms/_files/page_default_store.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+$store = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()
+    ->create(\Magento\Store\Model\Store::class);
+$store->load('default', 'code');
+
+$page = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()
+    ->create(\Magento\Cms\Model\Page::class);
+$page->setTitle('Cms page default store')
+    ->setIdentifier('page_default_store')
+    ->setStores([$store->getId()])
+    ->setIsActive(1)
+    ->setContent('<h1>Cms page default store</h1>')
+    ->setPageLayout('1column');
+$page->save();

dev/tests/integration/testsuite/Magento/Cms/_files/page_default_store_rollback.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+
+$pageRepository = $objectManager->get(\Magento\Cms\Api\PageRepositoryInterface::class);
+
+$searchCriteriaBuilder = $objectManager->get(\Magento\Framework\Api\SearchCriteriaBuilder::class);
+$searchCriteria = $searchCriteriaBuilder->addFilter('identifier', 'page_default_store')
+    ->create();
+$result = $pageRepository->getList($searchCriteria);
+foreach ($result->getItems() as $item) {
+    $pageRepository->delete($item);
+}