Hexblast bugged. Does not Benefit from multiple curses as stated

I have thoroughly tested the damage and animations. Hexblast is not hitting for any extra damage when monster has multiple curses (AS STATED IN THE TOOLTIP VIDEO). I have tested extensively and there is no damage boost or second attack. Secondly, spell echo doesn't work correctly when supported for this skill either.
Please fix.

same issue

Isn't this intended?

Its only supposed to detonate one curse at a time.


Hexblast

"Detonates [A] Curse"