HHH-10635 - Fix EntityManager.isOpen() should respect status of Session

(cherry picked from commit 2a79ebe165)

hibernate-entitymanager/src/main/java/org/hibernate/jpa/internal/EntityManagerImpl.java

@@ -154,7 +154,7 @@ public class EntityManagerImpl extends AbstractEntityManagerImpl implements Sess
 		checkEntityManagerFactory();
 		try {
 			if ( open ) {
-				internalGetSession().isOpen(); //to force enlistment in tx
+				open = internalGetSession().isOpen(); //to force enlistment in tx
 			}
 			return open;
 		}