Display Debuffs on Target

I’m not sure what this feature is supposed to be doing, you can see on the screen below :
The vampiric hero has been debuffed with CoF for more than 1s, yet there is no RR or CoF icon displayed, either on the HUD health bar (top of the screen) or the enemy health bar above the hero.

When I read about the change in the changelog, I expected a feature similar to GI that’d show the debuff skills above the mob directly, instead it shows some generic debuffs (sometimes) like flat RR or dots, which is not quite as useful

Do you have it enabled ?