Since Expansion release, Relic of the Thief does not correctly trigger on use of Revenant Greatsword 3 and 4(flipover). They both have a cooldown and cost energy, therefore qualify for applying stacks of the buff. I have already tested this after every patch since then, and reported it in game every time yet it remains unfixed.
Since I'm unaware, whether this issue exists on other weapons and classes as well, it would be great if players that have noticed these could chime in here as well.