I found this while running the ansible tests of vyos_firewall_rules: https://github.com/vyos/vyos.vyos/pull/407#issuecomment-2774775677
Paramiko is the default on Ubuntu, when just using `apt install ansible-playbook` with `ansible-galaxy install git+https://github.com/vyos/vyos.vyos.git`, so I guess this is widespread.
I don't know the exact cause for this issue with zero bytes, but the fix is quite easy. I'll push a PR soon after creating this issue.