Any meta tag that have a preset definition (mainly the moderator-tags and the required-tags, but there are possibly others that I don't know of, including maybe some that are not on metas) will take you to a nonexistent page like
https://meta.stackoverflow.com/posts//revisions when their tag wiki excerpt history is viewed. For larger sites, this is generally not going to be found as the excerpts have all been edited, but smaller sites will experience this more often. For example, discussion is broken right now on Drones and Model Aircraft Meta. The issue goes away when the excerpt is edited.
This was prompted by my meta SO post.