There should be a submenu that allows for restoring recently closed tabs, as in any recent web browser. When one has a lot of feeds and accidentally closes one tab, it is practically impossible to find it again via the list(s) of articles. Plus, the open tab may have displayed, thanks to session saving, an article that is no longer listed in the feed. (I'm not quite sure if this case is possible; Akregator might be as intelligent as not deleting such articles from feeds.) Reproducible: Always
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.