I have one too. Ventura works fine without making any changes to OCLP. I’ve used multiple nightly releases without any issues. Perhaps you could list every step that you take to get where you are.I have the Mac mini as yours.
Mac Mini 2012 boot and stuck "OCB: StartImage Failed - Already Started"
Which OCLP did u use to build the EFI? Do u select the default setting without any spoof?