Proxmox VE 9.2 installation hangs at 99% "make system bootable" on HPE ProLiant DL380 Gen12 – PVE 8.4 installs fine

​ I'm running into a reproducible issue trying to install Proxmox VE 9.x on an HPE ProLiant DL380 Gen12 . The server was previously running Proxmox VE 8.4 without any issues. The system uses a ZFS RAID1 root pool on two ~1.8 TB drives , with separate storage for the VMs. I initially attempted an upgrade from PVE 8.4 to PVE 9.x. The package upgrade itself appeared to complete and the installed…