Host IPv6 address disappears when enabling Docker IPv6 Network

Community
1

Hey there, maybe someone could give me a good advise to sort out the following issue
My Docker Host got its IPv6 settings automatically by DHCP but loses its IPv6 addresses when creating/using IPv6 Networks inside Docker.

Created the network with the following docker-compose parts:

version: '2.4'
networks:
  frontend:
    enable_ipv6: true
    ipam:
      config:
        - subnet: "fd00:0:0:0:3::/80"

Helped myself with a static entry in /etc/network/interfaces with the following, but it turned out that my public 2001: address stopped working and I would like to DHCP that again

iface enp0s31f6 inet6 static
      address 2001:a61:3a7c:8301:XXXX:XXXX:XXXX:XXXX
      netmask 64
      gateway 2001:a61:3a7c:8301:XXXX:XXXX:XXXX:XXXX
iface enp0s31f6 inet6 static
      address fd00::aaa1:XXXX:XXXX:XXXX
      netmask 64
      gateway fd00::2e91:XXXX:XXXX:XXXX

Ping on the gateway fd00::2e91:XXXX:XXXX:XXXX is working.

Some Sys-Infos:

# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 11 (bullseye)
Release:        11
Codename:       bullseye

# docker version
Client: Docker Engine - Community
 Version:           23.0.1
 API version:       1.42
 Go version:        go1.19.5
 Git commit:        a5ee5b1
 Built:             Thu Feb  9 19:46:54 2023
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          23.0.1
  API version:      1.42 (minimum version 1.12)
  Go version:       go1.19.5
  Git commit:       bc3805a
  Built:            Thu Feb  9 19:46:54 2023
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.16
  GitCommit:        31aa4358a36870b21a992d3ad2bef29e1d693bec
 runc:
  Version:          1.1.4
  GitCommit:        v1.1.4-0-g5fd4c4d
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0