Why the heck? (Gwenmaster question)

I feel like I must've missed something:
Doom is immune to her passive shock in the mystic phase
Colossus isn't immune to her passive frostbite in the cosmic phase
Is it anywhere stated why it is so? Because it makes no sense to me why one champ's immunity prevents the passive and the other one's doesn't
Doom is immune to her passive shock in the mystic phase
Colossus isn't immune to her passive frostbite in the cosmic phase
Is it anywhere stated why it is so? Because it makes no sense to me why one champ's immunity prevents the passive and the other one's doesn't
3
Comments
(I'm not saying it, it's what written there in Aarkus's cape, read it)
Kabam have used specific icons in the past that didn't match what they are commonly used for.
So to make it real easy for you to understand what I'm saying. I think there's a bug. I want to know if it's bugged in her listed abilities or in the pause menu with the icon being displayed.
I am fully aware that Colossus is immune to all Frostbite effects.
In other phases every thing went as normal.