6in4 tunnel at HE Tunnel Broker

I’ve set up a Linksys WRT1900ACS using firmware, LEDE Reboot 17.01.2 r3435-65eec8bd5f / LuCI lede-17.01 branch (git-17.152.82987-7f6fc16). The whole point is to access the IPv6 network via Hurricane Electric’s gateway. Finding a guide to IPv6 Transition Technology, on the LEDE Website, I copied the entire sample configuration into the ‘wan6’ stanza of /etc/config/network, with of course appropriate value substitutions. Like so:

config interface 'wan6'
    option ifname 'eth1'
#       option proto 'dhcpv6'
    option 'proto' '6in4'
    option 'mtu' '1424'                      # the IPv6 tunnel MTU (optional)
    option 'peeraddr' $MY_PEER-ADDRESS'          # the IPv4 tunnel endpoint at the tunnel provider
    option 'ip6addr' $MY_PREFIX::2/64'  # the IPv6 tunnel
    option 'ip6prefix' $MY_SLASH FORTY-EIGHT::/48 ' # Your routed prefix (required!)
            # configuration options below are only valid for HEnet tunnels. ignore them for other tunnel providers.
    option tunnelid '$MY_TUNNEL-ID'  # HE.net tunnel id
    option username '$USERNAME' # HE.net username used to login into tunnel
broker, not the User ID shown after login in.
    option password '$PASSWORD' # HE.net password if there is no updatekey for tunnel
    option updatekey '$UPDATE-KEY' # HE.net updatekey instead of password, default for new tunnels

I bounced the router and, like magic, the tunnel came up, IPv6 addresses flowed to my downstream devices and I could ping IPv6 addresses from my clients.
My question is this. When I browse to the interface configuration, http://shadow/cgi-bin/luci/admin/network/network/wan6, everything is as I entered in /etc/network but the “IPv6 Routed Prefix” is indicated in red. And, When I view the “Status Overview at, http://shadow/cgi-bin/luci/admin/status/overview, there is no IPv6 gateway listed. Nor is one apparent from the display of ipconfig.
Could there be something wrong with my “ip6prefix”, notwithstanding that I copy / pasted it right from HE’s tunnel detail page, https://tunnelbroker.net/tunnel_detail.php?tid=XXXXXX, and that everything works pretty much as expected?
I’m trying to learn about IPv6 and I’m puzzled by the behavior. I’d appreciate your advice and if you need my address details, we might engage in a PM.
![Believe (What you know) GE (What may go wrong)]

True to my tag line, when I "entered" my post, something about my text cause it to reformat a little, I hope you can interpret it. There is an octathorpe (#) in front of the line that says "option proto ‘dhcpv6’". That may be what through the editor into a fit.
![Believe (What you know) GE (What may go wrong)]