prop 312: Don't publish IPv6 address if ORPort is IPv4Only
Now that #40025 (closed) is merged, I believe there is an issue for which we assume we'll find an ORPort if we have found an IPv6 address.
In router_build_fresh_unsigned_routerinfo(), we should check at the returned value of router_get_advertised_or_port_by_af() and not publish a port value of 0. It is possible for instance if the ORPort is IPv4Only.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information