Cyclone of Tumult Skill Stage defaults to stage 1 when calculating Skill Trigger Rate of Active Spell (attached to CoC)

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What is the value from the calculation in-game?

The information is not available ingame

What is the value from the calculation in Path of Building?

https://i.imgur.com/zlEZiUR.png
https://i.imgur.com/FKlhQ1m.png

When setting the spell triggered via Cast on Critical Strike Support with the use of Cyclone of Tumult (Blazing Salvo in this case), the calculation is done on stage 1 of Cyclone of Tumult instead of the stage set, in this case stage 6.

The calculation in this example is done on aps of 4.05 for stage 1 when it should be on 8.09 of stage 6

How to reproduce the issue

You should be able to reproduce this with any Cast on Crit build using Cyclone of Tumult as proc'ing attack skill, Here is my current build with the issue in question:
https://pobb.in/4l8SCzb4IN-U

Character build code

https://pobb.in/4l8SCzb4IN-U

Screenshots

https://i.imgur.com/zlEZiUR.png
https://i.imgur.com/FKlhQ1m.png

Start by loading the linked PoB build and reproducing the Cast on Critical Strike calculation with Cyclone of Tumult set to stage 6. Trace the calculation entry point for the triggered spell's attack rate and verify that the result uses Cyclone's selected stage rather than stage 1; done when the displayed rate matches the stage 6 value.