Did I find a bug?
https://www.sixdegreesofwikipedia.com/?source=Adolf%20Hitler...
It's showing "Bill Gates" and "Mark Zuckerberg" as the hops, but on the start page I don't see links to those.
(Apologies for the subject matter. It was the first thing I thought of, because of a Wikipedia-path-finding game I had heard of before.)