Escape from Shio.

When the ritual is performed, it's unclear what to do next. I captured all the cities, approached Kha-Beleth, and nothing happens: no cutscenes, no battle, no freezes, and no crashes. I tried not touching the cities, and the result is the same.

That's strange; I tested this part, and everything was working correctly. Did you approach Kha-Beleth closely? Does the console work in the game?

Added 1 minute ago
Could you also clarify whether the quest to kill him is active and what the difficulty level is?

Added 3 minutes ago
If the difficulty level is Recruit, then I might know the reason.