I'm pretty sure the warning of HASH problems depends on SSV being enabled. I think it depends on how you did the Monterey installation.
In my case I installed Monterey starting directly from Catalina in this mode:
- first I created with OCLP 0.4.3 an EFI Boot with SMBIOS spoof "Minimal";
- so I downloaded the Monterey Installer from the App Store and installed Monterey as if my Mac was supported;
- at the end I put the Post Install Patch and finally I recreated an EFI Boot without any options or spoofs and put it back in the SSD with Monterey.
Everything works.
To understand what the SSV (Signed System Volume) is and what it does, read this article by the creators of "Silent Knight" ->
https://eclecticlight.co/2020/06/25/big-surs-signed-system-volume-added-security-protection/
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