DNS fails for IPv6 (macos)

I am trying to assign IPv6 addresses to loopback lo0 and access them through curl / browser with custom domain.

I've created ULA on lo0:

ifconfig lo0 inet6 fd56:dd46:5a5d:f2b5:3a51:916d:40ee:1b4a/128

and I have a tcp6 server listening on that IP.

I've created an AAAA RR that points echo to fd56:dd46:5a5d:f2b5:3a51:916d:40ee:1b4a.

It works properly with dig:

~: dig AAAA @127.100.0.16 echo

; <<>> DiG 9.10.6 <<>> AAAA @127.100.0.16 echo
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23372
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;echo.              IN  AAAA

;; ANSWER SECTION:
echo.           0   IN  AAAA    fd56:dd46:5a5d:f2b5:6065:7375:9039:7092

;; Query time: 0 msec
;; SERVER: 127.100.0.16#53(127.100.0.16)
;; WHEN: Thu Feb 09 18:40:03 CET 2023
;; MSG SIZE  rcvd: 54

~: dig A @127.100.0.16 echo

; <<>> DiG 9.10.6 <<>> A @127.100.0.16 echo
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42356
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;echo.              IN  A

;; Query time: 0 msec
;; SERVER: 127.100.0.16#53(127.100.0.16)
;; WHEN: Thu Feb 09 18:40:10 CET 2023
;; MSG SIZE  rcvd: 22

The service works, when I directly call it:

~: curl http://\[fd56:dd46:5a5d:f2b5:6065:7375:9039:7092\]:8080
{
  "path": "/",
  "headers": {
    "host": "[fd56:dd46:5a5d:f2b5:6065:7375:9039:7092]:8080",
    "user-agent": "curl/7.77.0",
    "accept": "*/*"
  },
  "method": "GET",
  "body": "",
  "fresh": false,
  "hostname": "[fd56:dd46:5a5d:f2b5:6065:7375:9039:7092]",
  "ip": "::ffff:172.18.0.3",
  "ips": [],
  "protocol": "http",
  "query": {},
  "subdomains": [],
  "xhr": false,
  "os": {
    "hostname": "e7362b9fe2a9"
  },
  "connection": {}
}

So I set my DNS preference to 127.100.0.16 (IP on which I run https://github.com/miekg/dns):

~: scutil --dns
DNS configuration

resolver #1
  search domain[0] : home
  nameserver[0] : 127.100.0.16
  flags    : Request A records
  reach    : 0x00030002 (Reachable,Local Address,Directly Reachable Address)
...

DNS configuration (for scoped queries)

resolver #1
  search domain[0] : home
  nameserver[0] : 127.100.0.16
  if_index : 18 (en5)
  flags    : Scoped, Request A records
  reach    : 0x00030002 (Reachable,Local Address,Directly Reachable Address)

Although, resolving echo domain does not work:

~: curl http://echo:8080
curl: (6) Could not resolve host: echo

From server's perspective I see that only request for A records is sent. There are no requests for AAAA record.

If I set /etc/hosts with:

fd56:dd46:5a5d:f2b5:3a51:916d:40ee:1b4a echo

then echo domain works.