The following config is what I used on my router to trigger this bug:
tunnel tun1 { 6rd-prefix 2607:FA48:6ED8::/45 6rd-relay-prefix 24.225.128.0/17 address 2607:FA48:6ED8:8A50::1/60 description "Videotron 6rd Tunnel" encapsulation sit firewall { in { ipv6-name WAN6_IN6 } local { ipv6-name WAN6_LOCAL6 } } local-ip 24.225.136.165 mtu 1480 multicast disable parameters { ip { ttl 255 } } remote-ip 24.225.128.1 }
Additionally, if I remove the local ip and commit, I will get a python stacktrace and a borked tunnel interface. If I commit again without changing anything, the tunnel is finally created but it still lacks a local ip.