Same thing with me, the VMs that run Windows on Proxmox do not display the HDD in the task manager, regardless of the Windows version. And all drivers installed. Not even the C: drive appears in the task manager.
Same issue here, cPanel 96.09 on Cloudlinux 8.3
Proxmox 6.4-8
PBS 1.1-9
I had run a manual backup of the VPS on PBS and the VM froze, I needed to unlock by the host shell to be able to restart the VM.
Then I had to buy new underwear.