IPV6 short format adresses being leaked in diagnostics despite anonymization via DNSMASQ ?

Unraid 7.1.4

Using Adguard-Home in Docker as a DNS service, using both an IPV4 and IPV6 address

Adguard-Home has "192.168.1.1 , 2xxx:1234:1234:1234::1" as addresses

(Note that this is not a "fe80:xxxx:xxxx:xxxx:xxxx" "local" iPV6 address but a Global Unicast address beginning with a "2xxx"

Assuming we all use IPV6/64, you can translate those addresses to 1234:1234:1234:1234::0000:0000:0000:0001

Diagnostics output :

Jun 24 23:20:25 Unraid dnsmasq[237168]: reading /etc/resolv.conf

Jun 24 23:20:25 Unraid dnsmasq[237168]: using nameserver 192.168.1.1#53

Jun 24 23:20:25 Unraid dnsmasq[237168]: using nameserver 2000:1234:1234:1234::1#53

Is my understanding correct that IPV6 Global Unicast Addresses are unique, bypass NAT and thus should not be "exposed/guessable" ?

Thanks