@stephenw10
No wireguard in my case. Now I use PPPoE only for IPv4 and HE GIF for the IPv6 testing and fallback. No problem with 13.x.x.x based sites currently, but I did not tested all of them.
I honestly don't understand what the relation to IPv6 is at all if packet capture shows that the connection is going through the IPv4 stack. I would be sure that it's some configuration error either from the provider's side or somewhere else on my end, but in fact, everything works directly, without pfSense.