At least it looks like I'm not the only one with this issue:
https://steamcommunity.com/app/1815330/discussions/0/3803901559412436955/
Edit: It looks like the issue was on my end after all, I moved the folder to a different drive and was able to complete the game without any issues. Yay!
proton 8.0-2x1 2023-06
Compatibility Report
System Information
I confirm:
Additional notes
Update: