On some hardware libvirt may report host as having multiple NUMA cells with a single socket.
Here an example: Kolla 2024.1 ubuntu-jammy on Intel(R) Xeon(R) Gold 6248 CPU @ 2.50GHz reports following topology:

# nova api microversion 2.87
cpu_info:
  arch: x86_64
  model: Cascadelake-Server-noTSX
  vendor: Intel
  topology:
    cells: 2
    sockets: 1
    cores: 20
    threads: 2
  features:
...

So calculation introduced in #466 expose only half of available vCPUs, while vcpus remains correct 80 cores...
Unfortunately gophercloud unaware of that cells field too:

https://github.com/gophercloud/gophercloud/blob/3008470746c071e0998c487ecd0bf54682a7e54a/openstack/compute/v2/hypervisors/results.go#L13-L17