I think it would be nice if there was a way to see the set of all posts one has bookmarked from a particular topic while looking through said particular topic.
Visually doing this in a “filter” format similar to when one filters by poster may be a good way of displaying the bookmarked posts, but displaying them in a similar way to how they are displayed in activity/bookmarks can also work.
This makes it easier to find a particular set or a singular post when someone has a large amount of bookmarked posts.
Sorry if this was suggested before.