withhttps://hibernate.atlassian.net/browse/HHH-12425 the Loader postpones the call to TwoPhaseLoad#afterInitialize().

What happens with a is that Loader#initilizeEntitiesAndCollection:

• First calls TwoPhaseLoad#initilizeEntity() that triggers a call to StatelessSessionImpl#get()

public Object get(String entityName, Serializable id, LockMode lockMode) {   

      .... 

   if ( temporaryPersistenceContext.isLoadFinished() ) {     

      temporaryPersistenceContext.clear();   

   }   

   return result;

}

that clears the PersistenceContext

• Then calls{{TwoPhaseLoad#afterInitialize()}}

public static void afterInitialize( final Object entity, final SharedSessionContractImplementor session) {   

   ...

   final EntityEntry entityEntry = persistenceContext.getEntry( entity );       

   entityEntry.getPersister().afterInitialize( entity, session );

}

but the PersistenceContext has been previously cleared so entityEntry is null and the call to entityEntry.getPersister() causes a NPE.