"Evasive" companion modifier bugged?

So I have rabid dog with haste aura and evasive. My evasion rating doesn't change at all is it bugged or does it just not show?

"Evasive - 100% increased Evasion Rating"

Is one description I see online but also

"Evasive - monster gains extra evasion based off their dexterity"

Id love to know thanks.