Skill perk don’t work

[Darklotusss]

Thank you for answering
I made some more tests, and results are pretty strange. Firstly, I tried with and without 25%ms elixir - same result, I get only +10%ms.
I dismissed pet, and unequipped every item. My base speed is 1.15x ( 10ms from location and 5ms passive)
Charged rally cry add 35%ms!!! Instead of expected 10%+10%. So with no equipment and no pet I get 1.5x speed after using rally cry skill.

Than I equipped zodias set 3/3. Still get +35%ms bonus
Added star beast set 3/3. Same result +35%ms bonus
Summoned a pet with h polar happiness bonus 30% stacking ms. Still same result - rally cry adds 35%ms!

And after I equipped insidious set - rally cry started to add 10%ms only

I tried different combination of gears and pets, but when I have equipped insidious set - skill gives only +10% ms, without insi set - +35%ms instead of 20% mentioned in description of skill. So seems something is working not as supposed.
If needed, I can make a video
Thank you

When using SS this perk will not stack and add to your ms if also using speed elixir

This perk is really only useful for someone without a SS I.e new players probably

[Tonebox]

Seems like that, but if it’s true, I don’t get the logic, why this perk won’t stack with SS, while the perk from Venegerful Blood which give +15%ms stacks perfectly with all my gear, including SS

[Darklotusss]

Maybe its that extra 5% putting over the limit for stacking maybe devs can confirm