No host access to custom networks via ipv6

Hi host access to custom networks via ipv6 does not seem to be working.

My unraid server is 192.168.9.2, and the container has ipv4 - 192.168.9.3, and ipv6 fd00:1234:9::3

From my unraid server, I cannot ping fd00:1234:9::3, but can successfully ping 192.168.9.3:

root@Param:~# ip route show
default via 192.168.9.1 dev shim-br0 
default via 192.168.9.1 dev br0 metric 2 
default via 192.168.13.1 dev br2 metric 22 
10.253.1.2 dev wg1 scope link 
10.253.1.3 dev wg1 scope link 
10.253.1.4 dev wg1 scope link 
10.253.1.5 dev wg1 scope link 
10.253.1.6 dev wg1 scope link 
10.253.1.7 dev wg1 scope link 
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 
172.18.0.0/16 dev br-a879dc0d84c2 proto kernel scope link src 172.18.0.1 
172.20.0.0/16 dev br-af81df2bf404 proto kernel scope link src 172.20.0.1 
192.168.9.0/28 dev shim-br0 proto kernel scope link src 192.168.9.2 
192.168.9.0/28 dev br0 proto kernel scope link src 192.168.9.2 metric 1 
192.168.13.0/26 dev br2 proto kernel scope link src 192.168.13.2 metric 1 
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown 
root@Param:~# ping 192.168.9.3
PING 192.168.9.3 (192.168.9.3) 56(84) bytes of data.
64 bytes from 192.168.9.3: icmp_seq=1 ttl=64 time=0.022 ms
64 bytes from 192.168.9.3: icmp_seq=2 ttl=64 time=0.032 ms
^C
--- 192.168.9.3 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1051ms
rtt min/avg/max/mdev = 0.022/0.027/0.032/0.005 ms
root@Param:~# ping6 fd00:1234:9::3
PING fd00:1234:9::3 (fd00:1234:9::3) 56 data bytes
From fd00:1234:9::2 icmp_seq=1 Destination unreachable: Address unreachable
From fd00:1234:9::2 icmp_seq=2 Destination unreachable: Address unreachable
From fd00:1234:9::2 icmp_seq=3 Destination unreachable: Address unreachable
^C
--- fd00:1234:9::3 ping statistics ---
4 packets transmitted, 0 received, +3 errors, 100% packet loss, time 3113ms

But I can ping that container from another computer in my network:

ping6 fd00:1234:9::3
PING6(56=40+8+8 bytes) fd00:1234:1:0:1853:65cd:d651:4bd1 --> fd00:1234:9::3
16 bytes from fd00:1234:9::3, icmp_seq=0 hlim=63 time=2.959 ms
16 bytes from fd00:1234:9::3, icmp_seq=1 hlim=63 time=3.777 ms
16 bytes from fd00:1234:9::3, icmp_seq=2 hlim=63 time=3.224 ms
^C
--- fd00:1234:9::3 ping6 statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 2.959/3.320/3.777/0.341 ms

My unraid server can ping other ipv6 addresses, so it is not an ipv6 config issue:

root@Param:~# ping6 fd00:1234:12::3
PING fd00:1234:12::3 (fd00:1234:12::3) 56 data bytes
64 bytes from fd00:1234:12::3: icmp_seq=1 ttl=63 time=0.627 ms
64 bytes from fd00:1234:12::3: icmp_seq=2 ttl=63 time=0.571 ms
^C
--- fd00:1234:12::3 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1058ms
rtt min/avg/max/mdev = 0.571/0.599/0.627/0.028 ms

Here is a screenshot of my routing table. There is no equivalent ipv6 shim-br0 network. Is that the issue?