#18956 Fixes for set root_category_id

Author: larsroettig

app/code/Magento/Store/Model/Config/Importer/Processor/Create.php

@@ -176,8 +176,8 @@ private function createGroups(array $items, array $data)
             );
 
             $group = $this->groupFactory->create();
-            $group->setData($groupData);
             $group->setRootCategoryId(0);
+            $group->setData($groupData);
 
             $group->getResource()->save($group);
             $group->getResource()->addCommitCallback(function () use ($data, $group, $website) {