Sequoia on MP 5.1

Hi, I’m trying to install macOS Sequoia on a 2010 MP. While initially succeeding, but failing to patch my RX560 successfully, now I always get a random error after the first reboot. I’m attaching a screenshot below. Any idea why this happens? As I start over with the installer after the error appears, I can see my target ssd now renamed with “- Data” after the original name. Thank you guys for any help you might give me.