I'm working on T2345, but the root issues probably aren't the same. Do you have service router-advert configured, and is it on a bridged interface? Then the cause is T2345. If not (if you have router-advert and dhcpv6-server on a eth interface) then this is a different issue.

restart dhcpv6 server might just have the wrong name of the interface, which changed recently. The service is now named isc-dhcp-server6 and status can be seen with sudo systemctl status isc-dhcp-server6.

https://github.com/vyos/vyos-1x/pull/364

Execute sudo systemctl status isc-dhcp-server6 output:

vyos@vyos:~$ sudo systemctl status isc-dhcp-server6
● isc-dhcp-server6.service - ISC DHCP IPv6 server
   Loaded: loaded (/lib/systemd/system/isc-dhcp-server6.service; disabled; vendo
   Active: inactive (dead)
     Docs: man:dhcpd(8)

I try to check the configuration for the following configuration, but unfortunately I still can't get the IPv6 address!

interface br1 {
}
interface br2 {
    name-server fc00:410:f1cd:101::1
}

My fix for that was merged 7 hours ago so your 202004210117 image doesn't contain it. https://github.com/vyos/vyos-1x/commit/c7d8e39be10a59d64be643cade2213c97f1e3639

IPv6 on bridges is still broken, I'm working on it right now.

Thank you very much! I hope to get the restored rolling image tomorrow or in the next few days. If it is repaired, can you reply me through this list?

At present, relevant functions are normal after virtual machine test! New bug found, see T2379 for details