The quest “A Magical Glow” is severely broken, collecting a swarm of 3 or 4 flies counts as just one fly and collecting the same flies again after they respawn does nothing. I was only able to find 19 swarms of flies and I need 25, so this quest is impossible to complete. Which is really bad, as it’s a campaign quest and I cannot progress the story due to this.
Edit: I logged in a day later, now the swarms I previously collected do award progress for a second time, however it is still just one fly per swarm. This at least allowed me to finish this quest. I tried re-logging yesterday as well, but that did not work.