I'm not sure this is a similar issue or not but it's driving me mad.
I've been running OCLP Monterey on my Mac Pro 5,1 2009 for a couple of years and it's been rock solid but now out of the blue I'm suddenly having startup disc problems. I have a system backup SSD in the DVD caddy space which I update from time to time with Carbon Copy Cloner. Of course I realise I can't actually boot from this but nonetheless it has saved my bacon on a few occasions and I'd like to keep it. Trouble is now this backup drive now seems to be appearing as my startup drive and the actual OCLP drive isn't even an option. I can't update OpenCore either because the updater wants to update the back up drive which it thinks is my startup drive. Booting with control key doesn't bring up the boot picker as it used to so I'm a bit at a loss.
Anyone else seen this before?