Arcane Acceleration(Max Rank) not working

[Infinitoar]

The Arcane, "Arcane Acceleration" at Max Rank is not firing Primary Weapons at 90% Fire Rate when triggered. I just recently tested this is on the Kuva Kohm. 

 

My test was in the Simulacrum with only Arcane Acceleration equipped and no other fire rate increase mods. When the Arcane activated, there was no change at all in the fire rate of the gun. 

 

I then unequipped the Arcane and used Frail Momentum(+90% Fire Rate/ -15% Damage) and there was a noticeable difference in the Fire Rate vs the Arcane. I feel this is a bug. I hope the team can resolve this soon. If this is not a bug then maybe I do not understand the application of this Arcane to Primary Weapons and would not mind being clarified on how it is supposed to perform. 

 

Thanks again!