The main issue seems to be that the notification needs to retain the reply ID rather than the topic ID so it can link directly to the new reply. However, since this discussion is quite old, I would be careful about copying the original workaround without checking compatibility with current bbPress and BuddyPress versions. Replacing core functions through hooks can also introduce problems with notification counts and duplicate entries, as the more recent comment suggests. I would recommend putting any customization in a small custom plugin rather than editing bbPress core or a theme file, and testing both the notification link and the unread notification count. The permanent bubble issue is particularly worth investigating before using this solution on a live forum.
