After encountering the bug in my 90hr playthrough, I decided to start a new game to see if I can avoid the cutscene bug, as changing alliances in a middle of a chapter, doing dlc's or asgardian questline, or reloading save files in cent doesn't seem to solve the issue. Looking at the previous discussion, the first instance of the bug that was fixed in some patch ago (somewhere with 1.3.1 I think?), a post tells that creating a new game with minimal settlement can avoid the bug, so I've tried it. After 20 hrs of focusing solely in all prerequisites of cent and reaching settlement level 3 (the only buildings I have are for the blacksmith (gunnar), hidden ones bureau (hytham), stable (holger), and the trading post (yanli), I have avoided the bug and progressed further. I have yet to confirm if this is a 100%, but at the very least, for those who want to continue playing the game even at the cost of losing their progress, this could be worth it.