While experimenting with ProtonVPN's Wireguard configs, I realized that my real IPv6 address was leaking while IPv4 was correctly going through the tunnel. How do I prevent this from happening?
I've already tried adding ::/0 to the AllowedIPs option and IPv6 is listed as disabled in the NetworkManager profile.
The true enterprise solution is to disable IPv6, if you disable IPv4 you might be surprised to see how many sites and services, even those run by large companies require IPv4.