Guild Wars 2

No creatures in Season 2 missions give experience, but “on kill” effects only trigger on enemies that give experience.

Because of this, all “on kill” effects won’ trigger within these missions, and all builds relying in “on kill” effects such as Renewed Justice are rendered utterly useless.

Thoroughly discussed here: https://forum-en.gw2archive.eu/forum/livingworld/lwd/Mobs-that-don-t-trigger-traits