RDF::Query: FILTER accidently moved into SERVICE

[nichtich]

use v5.14;
use RDF::Query;
say RDF::Query->new(join "", <DATA>)->as_sparql;
__DATA__
PREFIX bd: <http://www.bigdata.com/rdf#>
PREFIX wikibase: <http://wikiba.se/ontology#>
SELECT * WHERE {
    <http://www.wikidata.org/entity/Q1> ?p ?o .
    FILTER regex(?o,'^[0-9]+$') .
    SERVICE wikibase:label {
        bd:serviceParam wikibase:language "en" .
    }
}

Output

PREFIX bd: <http://www.bigdata.com/rdf#>
PREFIX wikibase: <http://wikiba.se/ontology#>
SELECT * WHERE {
    <http://www.wikidata.org/entity/Q1> ?p ?o .
    SERVICE wikibase:label {
        bd:serviceParam wikibase:language "en" .
            FILTER( REGEX(?o, "^[0-9]+$") ) .
    }
}

instead of

PREFIX bd: <http://www.bigdata.com/rdf#>
PREFIX wikibase: <http://wikiba.se/ontology#>
SELECT * WHERE {
    <http://www.wikidata.org/entity/Q1> ?p ?o .
    FILTER( REGEX(?o, "^[0-9]+$") ) .
    SERVICE wikibase:label {
        bd:serviceParam wikibase:language "en" .
    }
}

[kasei]

That's a strange one!