Well, another quick heads-up about this. My MBP 9,2 still has this issue, even with the RC. As I said before, I have workarounds so it doesn’t affect me much, but I just did something (on hindsight) very stupid.
The issue in a nutshell is that as soon as I mount a non-apple file system volume (FAT, FAT32, exFAT…) the Finder hangs and the OS is left in a zombie state, requiring a reboot and of course any operation you wanted to do with the mounted volume starts, but hangs and never finishes.
As I haven’t seen or heard anyone else with the same issue, I decided (very stupidly) to rebuild and reinstall OCLP using a freshly downloaded Sonoma-branch version, to see if by any chance it would improve things.
Well, OCLP built normally but as soon as I told it to install onto the disk, it mounted the EFI volume and… yes. As it’s not an apple format, the finder hung, the app deleted my “previous” efi folder and proceeded to hung right after so it never copied (it couldn’t) the new open core efi. Result: no more Sonoma boot.
The funny part is that just last week I erased all the other partitions and bootable USB sticks as “I’ve never had to use them” 😂😂. Just my luck.
Long story short, I used internet recovery to download and install Catalina on an external drive, downloaded OCLP Sonoma branch, ran it from Catalina, installed it onto my internal drive and recovered my Sonoma boot capabilities. That took a while 😂.
What worries me is that, as it stands, I won’t be able to update OCLP directly from Sonoma until I find out wtf is going on. Now I think it must be some piece of software I have installed, as I haven’t seen any of you guys having the issue, so I have a long road of sleuthing to travel.
Will report back if I find the cause. In the meantime, be aware of that so it doesn’t happen to you (and of course, I’m not deleting that Catalina install) 🤣
Now to get some sleep…