Beshmundir Temple Ingisson Campaign Quested Bugged

[dani3390 1]

Hi, this was reported various times here in the forum but there was never any official response regarding a possible solution or just acknoledging the problem, so here I am writing about this.
Basically, the step 'Advance into the Beshmundir Temple and destroy the Power Wardstone' of the last Inggison campaign quest 'It's Better! It's an Obelisk!' can't be completed, because the door in the Beshmundir Temple in the photo attached doesn't open.
I checked some tutorial videos of this quest on Youtube, and the door should easily open, but this doesn't happen, so I'd like to understand what I should do.
Is this indispensable? No, but I'd like to complete all the campaign quests (and the exp to spend less time in BT)
 

[Mr. Domik 22]

Hello.

There is no mistake here. You are not fully utilizing the mechanics of this dungeon. You must first destroy 10 Warrior Monument and then kill the boss (Ahbana the Wicked).
After the boss is killed, the door to the generator will open.

Tell me if I misunderstood you.

Спойлер

 

[dani3390 1]

WTF, LOL

Thank you very much