Had a Demon Cluster Task that I got around to doing and figure I kill Gargoyles since... y'know... Demon Slayer Perk works on them which should mean they're a Demon... only... apparently they don't count towards the task when killed.

Is this an oversight? It seems odd that the Demon Slayer Perk works on them and I think Silverlight / Darklight also works on them... yet they don't count as a Demon for Demon Cluster Tasks. I should also mention that you can't kill the Gargoyles in Kurdal's Dungeon due to this.