The Authorship tool fails for pages that contain a slash in the title.
List of authors of that article (e.g. https://xtools.wmflabs.org/articleinfo-authorship/en.wikipedia.org/Comet).
A fatal error has occurred within XTools. This has been automatically reported, but feel free to file a task on Phabricator (requires a Wikimedia account).
The server said: No route found for "GET /articleinfo-authorship/de.wikipedia.org/C/2019_Q4_(Borisov)" (from "https://xtools.wmflabs.org/articleinfo-authorship/de.wikipedia.org/C/2019_Q4_(Borisov)?uselang=en")
Encoding the slash symbol as %2F also fails: https://xtools.wmflabs.org/articleinfo-authorship/de.wikipedia.org/C%2F2019_Q4_(Borisov)
The requested URL /articleinfo-authorship/de.wikipedia.org/C/2019_Q4_(Borisov) was not found on this server.
XTools version: 3.10.5-36efb8f