Congrats on your MBP6,2! Maps is a known problem for all non-metal Macs patched with OCLP. In my experience, you need to revert to Big Sur for working Maps. Fortunately, with OCLP (Open Core), you can run two different versions of macOS very easily. While there has been some debate about the legality of running two versions of macOS, you can tell from earlier discussion that I have no standards or morals, so this isn't an issue for me.
To install Big Sur as a second macOS on your MBP6,2, do the following:
- Make sure you have enough storage space
- Add an APFS volume
- Use a bootable USB Big Sur macOS installer to install Big Sur in your newly added APFS volume
- Apply post-install patches to Big Sur with OCLP
That's it. Now you can choose between Big Sur and Sonoma when you boot your Mac. Enjoy.