Wireguard VPN Disable IPV6

[treycortez]

I've been searching for a solution, but to no avail.

I have an ASUS AX86U running ASUSwrt-Merlin 3004.388.7_beta1, connecting to ProtonVPN over Wireguard.

I want to disable IPv6 only when connected to the Wireguard Client.

I have tried inserting this into the configuration file:

pull-filter ignore "ifconfig-ipv6"
pull-filter ignore "route-ipv6"

but it did nothing. Is there some way to do this, or have I missed the obvious? Or is my only solution to disable IPv6 entirely / use OpenVPN (ugh...) to disable IPv6 only when connecting to the VPN?