debian 11 - qubes-vpn-setup with bad rules

[nyxnor]

related https://github.com/tasket/Qubes-vpn-support/issues/53

vpn-mullvad systemd[1]: Stopped VPN Client for Qubes proxyVM.
vpn-mullvad systemd[1]: Starting VPN Client for Qubes proxyVM...
vpn-mullvad qubes-vpn-setup[2658]: iptables: Bad rule (does a matching rule exist in that chain?).
vpn-mullvad qubes-vpn-setup[2663]: iptables: Bad rule (does a matching rule exist in that chain?).
vpn-mullvad qubes-vpn-setup[2665]: iptables: Bad rule (does a matching rule exist in that chain?).
vpn-mullvad qubes-vpn-setup[2655]: Error: Firewall rule(s) not enabled!
vpn-mullvad systemd[1]: qubes-vpn-handler.service: Control process exited, code=exited, status=1/FAILURE
vpn-mullvad qubes-vpn-setup[2666]: STOPPED network forwarding!
vpn-mullvad systemd[1]: qubes-vpn-handler.service: Failed with result 'exit-code'.
vpn-mullvad systemd[1]: Failed to start VPN Client for Qubes proxyVM.
vpn-mullvad systemd[1]: qubes-vpn-handler.service: Scheduled restart job, restart counter is at 84.
vpn-mullvad systemd[1]: Stopped VPN Client for Qubes proxyVM.
vpn-mullvad systemd[1]: Starting VPN Client for Qubes proxyVM...
vpn-mullvad qubes-vpn-setup[2672]: iptables: Bad rule (does a matching rule exist in that chain?).
vpn-mullvad qubes-vpn-setup[2674]: iptables: Bad rule (does a matching rule exist in that chain?).
vpn-mullvad qubes-vpn-setup[2676]: iptables: Bad rule (does a matching rule exist in that chain?).
vpn-mullvad qubes-vpn-setup[2669]: Error: Firewall rule(s) not enabled!
vpn-mullvad systemd[1]: qubes-vpn-handler.service: Control process exited, code=exited, status=1/FAILURE
vpn-mullvad qubes-vpn-setup[2677]: STOPPED network forwarding!
vpn-mullvad systemd[1]: qubes-vpn-handler.service: Failed with result 'exit-code'.
vpn-mullvad systemd[1]: Failed to start VPN Client for Qubes proxyVM.
vpn-mullvad systemd[1]: qubes-vpn-handler.service: Scheduled restart job, restart counter is at 85.
vpn-mullvad systemd[1]: Stopped VPN Client for Qubes proxyVM.
vpn-mullvad systemd[1]: Starting VPN Client for Qubes proxyVM...
vpn-mullvad qubes-vpn-setup[2685]: iptables: Bad rule (does a matching rule exist in that chain?).

It connects when using this

sudo openvpn --cd /rw/config/vpn --config vpn-client.conf --auth-user-pass userpassword.txt