OSPF authentication supported for IPv6 / OSPFv3?

[Cybertinus]

Hello Bird users,

I'm trying to get authentication enabled on my OSPF sessions. I'm 
running Bird 1.6.4 on Debian 9.8. I have the following config in my 
ospf.conf:
protocol ospf ospf1 {
    import filter only_loopbacks;
    export filter only_loopbacks;
    area 0.0.0.0 {
        interface "lo";
        interface "eno1" {
            type pointopoint;
            bfd on;
        };
        interface "eno2" {
            type pointopoint;
            bfd on;
        };
        interface "eno3" {
            type pointopoint;
            bfd on;
            authentication cryptographic;
            password "Test123";
        };
    };
}
I include this ospf.conf in both bird.conf and bird6.conf. For IPv4 Bird 
it works without an issue and the sessions (over eno3) are 
authenticated. For IPv6 I see the following error when I try to load the 
config:
# birdc6 configure check
BIRD 1.6.4 ready.
Reading configuration from /etc/bird/bird6.conf
/etc/bird/ospf.conf, line 17: Authentication not supported in OSPFv3

When I check https://bird.network.cz/?get_doc&v=16&f=bird-6.html#ss6.8 I 
see the following:
"authentication cryptographic
An authentication code is appended to every packet. The specific 
cryptographic algorithm is selected by option algorithm for each key. 
The default cryptographic algorithm for OSPFv2 keys is Keyed-MD5 and for 
OSPFv3 keys is HMAC-SHA-256. Passwords are not sent open via network, so 
this mechanism is quite secure. Packets can still be read by an 
attacker."

So, I think it should work for IPv6 too. What am I doing wrong? Or did I 
hit a bug of some kind?

Kind regards,
Cybertinus