EntityGraph and isMember functions generates illegal sql

@Entity
public static class Foo {
    @Id
    private Long id;
    @ManyToOne
    public Bar bar;
}

@Entity
public static class Bar {
    @Id
    private Long id;
    @ManyToMany(targetEntity = Foo.class, cascade = CascadeType.ALL)
    @JoinTable(name = "bar_foo",
            joinColumns = { @JoinColumn(name = "bar_id") },
            inverseJoinColumns = { @JoinColumn(name = "foo_id") })
    public Set<Foo> foos = new HashSet<Foo>();
}

CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Bar> cq = cb.createQuery(Bar.class);
Root<Bar> from = cq.from(Bar.class);

Expression<Set<Foo>> foos = from.get("foos");

cq.where(cb.isMember(foo, foos));

TypedQuery<Bar> query = em.createQuery(cq);

EntityGraph<Bar> barGraph = em.createEntityGraph( Bar.class );
barGraph.addAttributeNodes("foos");
query.setHint("javax.persistence.loadgraph", barGraph);

SELECT
    bar0_.id      AS id1_0_0_,
    foos1_.id     AS id1_1_1_,
    foos1_.bar_id AS bar_id1_0_0__,
    foos1_.foo_id AS foo_id2_4_0__
FROM
    Bar bar0_
WHERE
    ? IN
    (
        SELECT
            foos1_.foo_id
        FROM
            bar_foo foos1_
        WHERE
            bar0_.id=foos1_.bar_id
    )