Control: tags -1 patch Control: severity -1 serious (probably makes nbconvert/nbsphinx unusable)
xml-html-clean is in NEWhttps://ftp-master.debian.org/new/lxml-html-clean_0.1.0-1.html
Thanks - that and adding it to the Depends of python3-nbconvert should fix this bug.
From codesearch, other packages that may need such a Depends are html-text, extruct, python-html-sanitizer, napari, readability, calibre, python-webob.