When I request both permanent and temporary ipv6 addresses, I get both
addresses but dhcpd does DDNS updates for both in the ip6.arpa
zone. dhcpd should not be putting IA_TA addresses in DNS.

dhcpd.conf file:

#####
option domain-name "remote6.dragon.net";
option domain-name-servers 192.168.167.101;
default-lease-time 3600;
max-lease-time 7200;
log-facility local7;
update-static-leases on;
authoritative;

set vendor-string = option vendor-class-identifier;
stash-agent-options true;

ddns-update-style interim;
ddns-updates on;
ddns-domainname "remote6.dragon.net";
ddns-hostname = pick(option fqdn.hostname, option host-name,
                option dhcp6.fqdn, option fqdn.fqdn,
                concat("dyn-",binary-to-ascii(16,16,"-",
                substring(option dhcp6.ia-na, 16, 16))));
update-optimization false;

key ddns-key {
        algorithm HMAC-MD5;
        secret "XXXX";
};

zone 4.9.2.0.8.3.9.1.1.0.0.2.ip6.arpa {
        primary ddns.dragon.net;
        key ddns-key;
}

zone remote6.dragon.net {
        primary ns1.dragon.net;
        key ddns-key;
}

subnet6 2001:1938:294::/64 {
        range6 2001:1938:294::200 2001:1938:294::250;
        range6 2001:1938:294:cafe::/64 temporary;
}
#####