[Hunter][MM] True Aim and Vulnerable interaction

[Kynext]

WoW Freakz spell link:
https://www.wow-freakz.com/spells.php?spell=199527&&name=true-aim
https://www.wow-freakz.com/spells.php?spell=187131&&name=vulnerable
Bug description: While all the other Aimed Shot modifiers are calculated multiplicatively, when the target is affected by True Aim debuff and Vulnerable debuff, these 2 debuffs are calculated additively.
Proof: I have taken each talent commonly used and tested it, and on their own, or in some specific combination, they work just fine and the theoretical damage matches the damage reported by Details with errors of the 0,000 something magnitude. However, when we use in combination Vulnerable and True Aim, being target debuffs, the results are off and the difference increases the more modifiers we add. I believe, just like all the other modifiers presented in the following Excel Sheet, that these 2 debuffs should be calculated multiplicatively instead of additively:

I also added on the 2nd sheet pictures with the gear used and the stats.
Let me know if the spreadsheet can be accessed or if there are any questions.

https://docs.google.com/spreadsheets/d/1AImCWjT0mmQoxRZ-0CiSKjJILCyUKrb6Qwf0XBk5ADE/edit?usp=sharing

In the testing methodology I used a bow with a weapon damage of 6-10, which means only 5 values to be chosen for the formula, so theoretically, only 5 casts of Aimed Shot should be enough to determine the average.
I would like to add that, for example, the interaction between Vulnerable and Patient Sniper should be additive, because they are part of the same damage modifier whereas True Aim is a different one.

[CyberKing]

The report and the spreadsheet is very well done, a nice catch indeed.
https://trello.com/c/n2LZks4u/951-huntermarksmanship-true-aim-vs-vulnerability
Confirmed.

"The optimist thinks this is the best of all possible worlds. The pessimist fears it is true."