Qubes-fwupdmgr error

Hello,
I just tried to refresh the firmware update metadata with

$ sudo qubes-fwupdmgr refresh

and it outputs:

sudo qubes-fwupdmgr refresh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 15046  100 15046    0     0   5809      0  0:00:02  0:00:02 --:--:--  5807
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1803k  100 1803k    0     0   390k      0  0:00:04  0:00:04 --:--:--  390k
Validating directories
cat: /home/user/.cache/fwupd/metadata/firmware.xml.zst.asc: No such file or directory
Failed to refresh remote 'lvfs': qvm-run: Copying metadata signature failed!!

What is the problem that the copy process fails? Is it a known bug?

Additional Information: Dom0 is up to date with stable channel and sys-whonix as dom0 update qube also. sys-whonix also has fwupd-qubes-vm installed

I just ran into this too. It looks like LVFS has stopped publishing the PGP signature that qubes-fwupdmgr requires. I filed an issue. Unfortunately, this does not look easy to fix.