Immobilised Damage bonus not working on heavy stunned enemies

I'm playing a heavy stun build with warrior and There is 2 small and 1 notable passive on Warriors side with ' % Increased Melee damage against Immobilised enemies'. Notable passive is called 'Honourless'.

Heavy stunned enemies are also in immobilised enemies tag since they cant take action.

I recorded my battle with the boss and when the boss entered into heavy stun duration, there is not even a slight damage increase. Those passives with my Hulking form give %110 increase damage againtst immobilised enemies. I should be able to notice a difference.

I was using resonating shield / shield charge / shield wall skills.