Federation/Subquery bug ?

hi all,

this query with Fuseki 0.2.7 on a TDB with named graphs yields 2 for ?c:

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select (count(*) as ?c) where { graph ?g {
SERVICE <http://127.0.0.1:3030/datasets/query> {
?d rdfs:subClassOf <example>

?s ?p ?d
} }

But as soon as I wrap it as subquery, ?c is 9436 - the number of all triples
from all named graphs:

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select ?c where {

select (count(*) as ?c) where { graph ?g {
SERVICE <http://127.0.0.1:3030/datasets/query> {
?d rdfs:subClassOf <example>

?s ?p ?d
} }

(The federated subquery on http://127.0.0.1:3030/datasets/query has one
subclass as result)

Is this a bug or a misunderstanding ?

Regards,

Michael Brunnbauer