@cdf
In my limited experience, the issue of not being able to update Monterey beta 5 to beta 6 is NOT related to OpenCore as such, and probably not truly related to T2 hardware. Up to now, I've refrained from installing Monterey on a physical Mac, and I've been happy to run it on a Parallels virtual machine (running on my Mac Pro 5,1). As I've said before, the beta 5 Software Update showed an unusual message when trying to update to anything (something like the administrator wouldn't let it go beyond its current situation), and when I reinstalled the developer profile, it would search for a Monterey update, download that, in fact, was version 5, install it and get exactly to the same spot, with version 5 in place after more than one hour of this nonsense. After installing the version 6 pkg, the update was successful, and now the odd message that beta 5 used to show is no longer there. Again, this has nothing to do with OpenCore or T2 hardware.