On the patch notes, its listed that you “Fixed an issue where attacks that do Area of Effect damage wouldn’t trigger effect that trigger on Critical Hits - such as Siennas Fireball Staff with a charged attack.” It doesn’t seem that this is the case as long as you are not the host - atleast for Hagbane Swiftbow.
Steps to Reproduce:
- Equip a Hagbane Swiftbow with Scrounger
- Enter someone elses game
- Shoot a Charged Attack at the floor around enemies/into a horde and hope for a crit
- Watch it apply only 1 instance of the Scrounger effect (assuming you hit an enemy with the arrow itself) or 0 instances (assuming you hit the floor)