[IPv6] Resolving doesnt work

[Operations8]

I run docker on a debian 12 virtual machine. Debian host has got a static IPv6 ip (from the subnet from my ISP)
adguardhome docker is in bridge mode.

debian IP adressen:

2a**:::20::245
172...245

nslookup
server 2a**:::20::245
google.com

Gives me a time out

nslookup
server 172...245
google.com

Responds with a IPv4 address.

Setup Guide from adguardhome, shows me this:

127.0.0.1
::1
172.17.0.2
2001:db8:1::242:ac11:2

'
daemon.json:
{
"ipv6": true,
"fixed-cidr-v6": "2001:db8:1::/64",
"experimental": true,
"ip6tables": true
}
'
2001 = not my ISP subnet

When i look via Portainer to the adguardhome container network:

bridge | 172.17.0.2 | 172.17.0.1
  | 2001:db8:1::242:ac11:2 | 2001:db8:1::1

my docker-compose file:
`
version: "2"

services:
adguardhome:
image: adguard/adguardhome
network_mode: bridge
container_name: adguardhome
restart: unless-stopped
volumes:
- ./config:/opt/adguardhome/work
- ./config:/opt/adguardhome/conf
- /home/nick/NPM/letsencrypt:/opt/adguardhome/ssl
ports:
- 172.16.20.245:53:53/udp
- 53:53/tcp
- 784:784/udp
- 853:853/tcp
- 3333:3000/tcp
- 99:80/tcp
- 459:443/tcp

`

I have seen a lot of maybe solutions using macvlan. But i also sometimes read you should avoid using macvlan in docker. Since i am way more a windows guy, i am still learning and not sure if A is true of B is true. So in this cause i am trying to not use macvlan because as far as i can find what i have done should work.

Could you guys tell me why this is not working?

[amrmzr]

Debian has issues with ipv6 addresses, i solved mine yesterday by turning off ipv6.
Only ipv4 is on and now adguard home is working.
Just check in case what is listening on port 546