Whonix KVM on NixOS - "no storage vol with matching name"

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When I’m launching either the Whonix Gateway or Workstation virtual machine from the Virtual Machine Manager GUI on NixOS 26.05 I get the following error:

Error starting domain: Storage volume not found: no storage vol with matching name ‘Whonix-Gateway.qcow2’

I’ve configured libvirtd on NixOS with some settings that allow Virtual Machine Manager to run on NixOS:

  virtualisation.libvirtd.enable = true;
  programs.virt-manager.enable = true;

This is in Home Manager, an abstraction over the XDG configuration directories:

  # To make virt-manager work on Wayland, it needs to have its own cursor defined.
  # See https://wiki.nixos.org/wiki/Virt-manager#Wayland.
  home.pointerCursor = {
    gtk.enable = true;
    package = pkgs.vanilla-dmz;
    name = "Vanilla-DMZ";
  };

My user account has also been added to the libvirtd and kvm groups.

I’ve decompressed the qcow2 images and copied them to ~/.local/share/images:

cp --sparse=always Whonix-Gateway*.qcow2 ~/.local/share/images/Whonix-Gateway.qcow2

cp --sparse=always Whonix-Workstation*.qcow2 ~/.local/share/images/Whonix-Workstation.qcow2

I’ve also tried this by copying the images to /var/lib/libvirt/images/.