If I try to visit a deleted topic (by clicking a notification, for example) in the DiscourseHub app, I obviously get a 404 page. Some stuff is disabled on 404 pages. For example, I can’t tell that I’m logged in. Presumably this is to decrease server load. Makes sense.
But the problem is that I’m also unable to see the controls at the bottom of the page. Why should I not be able to go forward or back or switch to a different Discourse instance just because I’m on a 404 page?