compaction with URL context doesn't work

[JPEWdev]

Specifying a URL as the context when compacting doesn't work. The following example program demonstrates:

#! /usr/bin/env python3
from pyld import jsonld
import json
import pprint

doc = {
    "@graph": [
        {
            "@id": "_:build_Build0",
            "@type": "https://spdx.org/rdf/v3/Build/Build",
            "https://spdx.org/rdf/v3/Build/buildType": "http://openembedded.org/bitbake",
            "https://spdx.org/rdf/v3/Core/creationInfo": "_:core_CreationInfo111",
        },
    ]
}

pprint.pprint(jsonld.compact(doc, "https://spdx.github.io/spdx-3-model/context.json"))

No compaction is done, but it does work correctly if I manually download the context from the URL and load as a python dictionary