this problem is replicable
(tried 2 socket xeon E5645, 2 socket E5-2637 v2, 2 socket CPU E5-2620 v3, 2 socket CPU E5-2650 v4, 2 socket Xeon Silver 4216):
install proxmox (tried 6.4 and 7.2 +7.3)
create a vm with debian 8 or ubuntu 12.04 or lower on ceph or zfs
(because virtio scsi is not...