MAGETWO-56778: Value for multiple select attribute does not save

Author: vnayda

lib/internal/Magento/Framework/EntityManager/Observer/AfterEntitySave.php

@@ -27,6 +27,9 @@ public function execute(Observer $observer)
     {
         $entity = $observer->getEvent()->getEntity();
         if ($entity instanceof AbstractModel) {
+            if (method_exists($entity->getResource(), 'loadAllAttributes')) {
+                $entity->getResource()->loadAllAttributes();
+            }
             $entity->getResource()->afterSave($entity);
             $entity->afterSave();
             $entity->getResource()->addCommitCallback([$entity, 'afterCommitCallback']);