I'm running Open Core with Monterey on a 2012 Mac Pro, this scares me. I've never had a problem but I've heard of folks with issues that are truly terrifying. Did you have any warning signs? Did you update anything?
Typed this on my 2013 Macbook Pro with Catalina!
There were no warning signs, yesterday everything just froze, I was converting tv shows from a dvd.
then I stopped this project but even just using the MacBook Pro after a minute or so, everything would freeze.
I do have a dual boot 2 drives but who doesn't now?
last Thursday I installed OCLP Monterey on a new SSD 1TB and had trouble since the first boot.
finally everything worked great yesterday then the freezing happened.
I had to reinstall Catalina after unsuccessful attempts to get anything to work.
now I'm typing this on the MacBook Air M1 while Catalina is on the MBPro 12 which no problems.