Parsing under RDF-star mode seems to fail some spec tests

For example, when parsing with the format `application/n-triples*`, the spec test `https://w3c.github.io/rdf-tests/rdf/rdf11/rdf-n-triples/nt-syntax-bad-uri-06.nt` parses successfully, while an error is expected.
```
# No relative IRIs in N-Triples
<s> <http://example/p> <http://example/o> .
```