When I install HexOs in a Proxmox VM I'm running into this issue. I have two Proxmox machines: one using SATA passthrough and the other using NVMe passthrough. When I attach the disks to the VMs and start the installation, the HexOS installation freezes during pool creation. However, if I install HexOS without the disks already attached, the installation completes successfully. After restarting HexOS, I can add the disks and create the pool without any issues.
Perhaps this is also related too your error message.