You’re not supposed to do that.
You can change sys-whonix’s Net Qube setting from sys-firewall to sys-vpn. That would be okay.
But please do not attempt to use anon-whonix directly with sys-vpn. It’s not designed for that. anon-whonix should always be conneted to a Whonix-Gateway.
Any onion proof of work issues:
- should be totally unrelated to use of VPN vs not VPN. Can you confirm that?
- could be due to the Tor version used by Whonix. But that’s not something you can easily fix as a user. It will get fixed at some point for sure. No ETA (estimated time of arrival). References: