struct dhcp6.Packet cannot match DHCPv6 relay pack

[zakoland]

Hello:
As title
"""
p := new(dhcp6.Packet)
if err := p.UnmarshalBinary(b); err != nil {
return nil, err
}
"""
When ParseRequest UnmarshalBinary a dhcpv6 relay request, because of the structure does not match, it will lead to failure.