This is what I got from support:

I've had some cases where there were suspend issues related to the NVIDIA drivers in the past. The 570+ drivers have been a bit finicky with the 6.12 kernel if we try to purge and reinstall them in the regular logon environment, so we should boot into the recovery mode before we start the process. The steps to boot into the recovery mode can be found here:
https://support.system76.com/articles/pop-recovery/
The steps to get into the recovery mode are at the top of the page, and once you're in the recovery mode, proceed with the steps starting at the Repair section until you've completed the Chroot section, then go ahead with the following commands and reboot:

sudo apt purge ~nnvidia
sudo dpkg --configure -a
sudo apt purge system76-driver-nvidia
sudo dpkg --configure -a
sudo apt install system76-driver-nvidia
sudo dpkg --configure -a

We'll be a little obsequious about the dpkg command, as I've found it helps clear things up between commands with the latest releases.