PC/Steam for me, but I’m willing to bet it’s all platforms.
What you were expecting to happen, and what actually happened:
Expecting that when a Valraven replaces a troop in World Event, it would count as killing the troop it replaces for Campaign Tasks.
How often does this happen? When did it begin happening?
Every Time. Ever since the Campaign began
Steps to make it happen again
Watch the Valraven replace the needed troop, and get no credit for it.
6th week of the campaign and this has not been fixed yet.