Issues with simple irule for URL redirect and IPv6

Hello,

We've just started up our website with ipv6 on the outside, it still terminates and translates to IPv4 in the bigip. With a VS on IPv6 and pool with IPv4 adresses. Due to how the website it built with links and such we need to redirect everyone that is connecting to https://www.oursite.net to https://oursite.net. This works great on the normal IPv4 VS. with the following irule.

when HTTP_REQUEST {
    if { [HTTP::host] equals "www.oursite.net" }{
    HTTP::redirect "https://oursite.net[HTTP::uri]"
    }
}

But for some reason this does not work when applied to the IPv6 VS. How come? Did any of you come up with this issue?

We are running 11.6.2 HF1