RHEL 9.0 ProxMox install = kernel panic

I am attempting to install RHEL 9.0 GA in Proxmox (v7.1), but I get a kernel panic on boot during the install. Same issue with 9.0 Beta a couple of weeks ago.

I can't cut/paste from the ProxMox console, so see attached image. The most I can tell is that the root filesystem can't be mounted.

I've had no problems installing RHEL 8.6 Beta or GA on this system.

Thoughts?