IPv6 address on AdguardHome but UDM keeps advertising its own IP as DNS

Describe the bug I installed AdguardHome via these utilities, with IPv6 support. All works and I can ping AdguardHome (fd04::4:5) via v6 from my workstation.

However, Unifi keeps advertising it's own IP (2a10:.....)as a DNS server as well.

Did I forget to configure something or did I make a mistake? Or is this a unifi bug?

Expected behavior The DHCPv6 to only announce the custom DNS.

Screenshots Unifi network config for my primary network (LAN):

DNS addresses obtained by my Macbook:

Additional info

{
  "cniVersion": "0.4.0",
  "name": "dns",
  "plugins": [
    {
      "type": "macvlan",
      "mode": "bridge",
      "master": "br4",
      "mac": "00:1c:b4:ab:12:ff",
      "ipam": {
        "type": "static",
        "addresses": [
          {
            "address": "192.168.4.5/24",
            "gateway": "192.168.4.1"
          },
          {
              "address": "fd04::4:5/64",
              "gateway": "fd04::"
          }
        ],
        "routes": [
          {"dst": "0.0.0.0/0"}, {"dst": "::/0"}
        ]
      }
    }
  ]
}

UDM Information

Variant Dream Machine Pro
Firmware Version: 1.12.30
Controller Version 7.2.94

unifi-utilities / unifios-utilities

IPv6 address on AdguardHome but UDM keeps advertising its own IP as DNS #434