These Unity issues have been reported before. I am waiting to get more information from the team as it’s hard to determine why these are happening for some people and not everyone, as the issue itself is Unity crashing. So, if it was a whole game data issue, you would expect everyone to get this Unity crashing error.
I don’t have any troubleshooting I can share, other than just making sure you have recently verified your game files on Steam.
For me, I believe I started seeing an increase in crashes on PC around the 9.1 update.
I try to load up the game and it’ll just crash out. I’ll close it, restart and then it’s fine. I’m struggling to remember if it happened during a battle, but I don’t play very much right now.
Unfortunately I cannot give any more details than that.
I too have noticed completely random (ie every time it’s happened, what was being done in the game was different) crashes to the home screen. It has cost me sigils in underspire as well as the weekly guild events, but hey.