CdiQueryInvocationContext#isNew does not work well with OpenJpa and detached entities

I'm trying to use org.apache.deltaspike.data.api.EntityRepository on TomEE 1.5.2 with detached entities. Whenever I try to call the save method of EntityRepository I get

org.apache.openjpa.persistence.EntityExistsException: Attempt to persist detached object

CdiQueryInvocationContex#isNew returns true for my detached entity and and because of that EntityManager#persist is called.

see org.apache.deltaspike.data.impl.handler.EntityRepositoryHandler#save

From OpenJpaPersistenceUtil#getIdentifier(OpenJPAEntityManagerFactory emf, Object entity)

    /**
     * Get the object identifier for a persistent entity managed by one
     * of the entity managers of the specified entity manager factory.
     * @return The identifier of the entity or null if the entity does
     * not have an identifier assigned or is not managed by any of the
     * entity managers of the entity manager factory.
     */