Often times, when an app produces a notification, and I try to click on the activate button, the wrong application will open, specifically qBitTorrent. As far as I know, applications with more than one or custom buttons will work correctly. (but dont quote me on that)
Sounds like a bug.
Please file an issue here upstream:
Just wondering if this is a plank issue. What happens if you remove/stop plank and instead add the icon-task-list applet to your panel (logout and login after that)?
Same issue. If qbittorrent is running, it pops up, if its not, the firefox icon lights up but doesnt open