What version of Go are you using (go version)?

$ go version

go version go1.18.1 darwin/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

$ go env
GOARCH="amd64"
GOOS="darwin"

What did you do?

Resolving an unexisting domain via a custom DNS server returns an error message with the host DNS server address instead of custom.
When I tried to resolve the domain, that exists on my local network DNS server but doesn't exist on custom (external in my case), I got the same error. That's why I assume that go correctly uses custom DNS, but when it generates a message, it ignores configured resolver server

package main

import (
	"context"
	"fmt"
	"net"
	"time"
)

func main() {
	resolver := &net.Resolver{
		PreferGo:     true,
		StrictErrors: true,
		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
			d := net.Dialer{
				Timeout: 3 * time.Second,
			}
			return d.DialContext(ctx, "udp", "1.1.1.1:53")
		},
	}
	addrs, err := resolver.LookupIPAddr(context.Background(), "fake.domain")
	if err != nil {
		panic(err)
	}

	fmt.Println(addrs)
}

What did you expect to see?

panic: lookup manager.pls.pbank.com.ua on 1.1.1.1:53: no such host

What did you see instead?

panic: lookup manager.pls.pbank.com.ua on 192.168.1.1:53: no such host