Guest and Reporter "Page History" gets 404
If a Guest or Reporter of a project clicks the "Page History" button they get a 404. This occurs on v8.6.
A Guest or Reporter does not have permission to edit the page history but the "Page History" button should be available for them to press and view the change history for the page. It's kind of a key WIKI differentiator from a web page.
If getting Page History button to work properly for Guest & Reporter turns out to be non-trivial, at least hide or grey-out / make non-functional the "Page History" button for a Guest or Reporter.
Not sure if it matters but this was a private project in a private group with the Guest / Reporter added at the Group level. No users were added at the project level.