Bookmark posts with anchors break permalinks

When submitting a bookmark post with an anchor (example) the submission is successful but the IndieNews permalink fails, returning 404 (https://news.indieweb.org/en/indiebookclub.biz/updates#post-2022-11-14)

I imagine the fragment should be converted to a unique slug for use in the IndieNews permalinks, like updates-post-2022-11-14.