I tried the console – nothing happens.
P.S. Okay, I removed the archangels and then the dragons using the console and proceeded to the second mission. I played for 4 months, after which I encountered the same issue – the dialogue with Gurk doesn't trigger. I repeat, the game is initially version 3.1 (I bought it later), and I haven't had any problems until now... Moreover, I completed these missions on separate maps. Could it be that a mod is needed for non-standard dialogues?