I'm having the exact same issue as a Paladin Oathbreaker Dark Urge, except that I load up to 67% before the game crashes.
I can still get the Voss cutscene going back everywhere else in Act 1, but then going in Act 2 through the Mountainpass or through the Grymforge area both crashes the game.
Additional Long Rests do not fix the issue.
I had a save right before the end of the Crèche,
, and managed to leave the crèche and load Act 2 properly without triggering Voss' cutscene.
My thought process was to load it in and hope having it saved in the cache would help, and reached the closest waypoint so I can go back and finish the Crèche and fast travel to it instead.
But instead, the game now crashes when loading the Mountainpass area but not any other part of Act 1, which seems to be a similar issue other people are experiencing currently when trying to go back to a previous act or area.
TLDR: Voss' cutscene or something in the very last room of the Crèche is preventing going in Act 2, and going in Act 2 preemptively currently prevents going back in the Mountainpass area, making it impossible to finish the Crèche and keep playing.
To note: Unsure if related, but when traveling back to any other area of Act 1, or when approaching one of the possible paths back from Act 2 to Act 1, I'm also getting a Backpack with a Goodberry in it which I believe might be the belongings of Halsin as he doesn't show up in my camp anymore.