But when I reference my bookmarks, the tag I’ve assigned doesn’t show up. What shows up is the title of the thread that contains the bookmarked post, which is far less useful.
Ok, figured it out. If I click on my user icon in the upper right then click on the bookmarks icon a popup appears below listing the bookmarks according to the thread they’re in - not very useful (given how threads tend to drift). However! if I then click on the down arrow at the bottom of the popup the page clears and the bookmark listing is expanded with the tag I assigned to it - very useful.