I spoke too soon. It still crashes. PC version.
@asryan2a I have a 3900X, 32GB of RAM, and a 3080, all drivers and updates are current, so I know it's not my PC. Also, AC Valhalla is the only game I've played since I build this PC that crashes.
I was able to play for over 1 hour without crashing since the latest patch (as opposed to 15-30 minutes), so fingers crossed.