Voltaic Mark Weapon Swap bug

Hello,

I found a bug as an Invoker Monk:
When using Voltaic Mark on weapon set II (took curse nodes on tree for my second weapon set) with Hand of Chayula the Nova effect of the mark does not trigger.
I made sure I have enough primary stats on Weapon set I and II (both quarterstaffs).
I even have Whispers of doom on main tree, it applies all 3 icons on the enemy but does not trigger the Nova Explosion on death with weapon II, If I change it on weapon I it triggers the explosion properly. Thus loosing the benefit of the second set nodes for curses.

Regards,
A fellow Exile