Hibernate facet is configured for current module.
A Dao class in the module looks like this:

public class BazDAO extends HibernateDaoSupport {
    public List findSomething() {
        final HibernateTemplate templ = getHibernateTemplate();
        return templ.executeFind(new HibernateCallback() {
            public Object doInHibernate(final Session session) {
                final String hql =
                    "from Baz baz where baz.barId = 1 and baz.fooId = 2";
                final Query query = session.createQuery(hql);
                return query.list();
            }
        });
    }
}

In the injected HQL, invoke Refactor->Rename for the alias "baz" used in the embedded HQL query. Choose Preview.

Shown preview has three problems:
1) Current Java file is shown with "excluded" icon (it has regular Java icon in normal editor tab, as expected)
2) Error markers are shown for the preview of the Java file that will be affected (because it's interpreted as HQL?)
3) Occurence highlighting inside preview window is incorrect: it seems to apply the character index values for the injected fragment to the outer file

In addition, perhaps "Unclassified usage" could be something more descriptive?

Note that running a preview for an entity query alias is a bit silly, since occurrences are always limited to the query.
However, I've seen similar errors for other rename actions affecting HQL, for example: renaming entity itself.

Issue was resolved