That isn’t surprising, as a.gup.pe is designed to work with microblogs such as mastodon. If they didn’t work in the microblog interface I would have said that there’s a pretty bad bug somewhere.
Do they work in the magazines section though? Because in a few ways that’s more interesting … all of hte replies would be rendered as threads of comments. Though … I’ve forgotten … kbin is doing that already with the microblogs?