MAGETWO-61178: Inconsistent sales_order_item information after upgrade

Author: Sergii Kovalenko

lib/internal/Magento/Framework/Model/ResourceModel/Db/Collection/AbstractCollection.php

@@ -571,8 +571,13 @@ protected function _afterLoad()
         parent::_afterLoad();
         foreach ($this->_items as $item) {
             $item->setOrigData();
-            if ($this->_resetItemsDataChanged && ($item instanceof \Magento\Framework\Model\AbstractModel)) {
-                $item->setDataChanges(false);
+
+            if ($item instanceof \Magento\Framework\Model\AbstractModel) {
+                $this->getResource()->unserializeFields($item);
+
+                if ($this->_resetItemsDataChanged) {
+                    $item->setDataChanges(false);
+                }
             }
         }
         $this->_eventManager->dispatch('core_collection_abstract_load_after', ['collection' => $this]);