after twice nslookup server unknow 使用两次nslookup后server显示unknow

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [X] I have searched other issues and found no duplicates

- [x] I want to report a bug and not ask a question

### Operating system type

Linux, OpenWrt

### CPU architecture

x86

### Installation

GitHub releases or script from README

### Setup

On a router, DHCP is handled by the router

### AdGuard Home version

v0.107.26

### Description

#### What did you do?
我在私人反向dns地址设置了smartdns的地址,然后把使用私人反向dns解析打开了
i set Private reverse DNS servers smartdns address and enable Use private reverse DNS resolvers
#### Expected result
每次nslookup都能正常显示server名称
twice nslookup can show servername
#### Actual result
第一次nslookup显示server地址是正确的，第二次不正常显示unkonw
first nslookup can be show servername,second nslookup can`t show servername
#### Screenshots (if applicable)
Here's me my nslookup debug
我用nslookup 加个debug选项结果

```none
C:\Users\Administrator>nslookup -debug portal.cloudpeter.com 172.16.0.2
------------
Got answer:
HEADER:
opcode = QUERY, id = 1, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 0, additional = 0

QUESTIONS:
2.0.16.172.in-addr.arpa, type = PTR, class = IN
ANSWERS:
-> 2.0.16.172.in-addr.arpa
name = OpenWrt
ttl = 30 (30 secs)

------------
Server: OpenWrt
Address: 172.16.0.2

------------
Got answer:
HEADER:
opcode = QUERY, id = 2, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 0, additional = 0

QUESTIONS:
portal.cloudpeter.com, type = A, class = IN
ANSWERS:
-> portal.cloudpeter.com
internet address = 172.16.0.6
ttl = 10 (10 secs)

------------

非权威应答:

------------
Got answer:
HEADER:
opcode = QUERY, id = 3, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 0, additional = 0

QUESTIONS:
portal.cloudpeter.com, type = AAAA, class = IN

------------
名称: portal.cloudpeter.com
Address: 172.16.0.6
```

```none
C:\Users\Administrator>nslookup -debug portal.cloudpeter.com 172.16.0.2
------------
Got answer:
HEADER:
opcode = QUERY, id = 1, rcode = NXDOMAIN
header flags: response, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 1, additional = 0

QUESTIONS:
2.0.16.172.in-addr.arpa, type = PTR, class = IN
AUTHORITY RECORDS:
-> 2.0.16.172.in-addr.arpa
ttl = 10 (10 secs)
primary name server = fake-for-negative-caching.adguard.com
responsible mail addr = hostmaster.2.0.16.172.in-addr.arpa
serial = 100500
refresh = 1800 (30 mins)
retry = 900 (15 mins)
expire = 604800 (7 days)
default TTL = 86400 (1 day)

------------
Server: UnKnown
Address: 172.16.0.2

------------
Got answer:
HEADER:
opcode = QUERY, id = 2, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 0, additional = 0

QUESTIONS:
portal.cloudpeter.com, type = A, class = IN
ANSWERS:
-> portal.cloudpeter.com
internet address = 172.16.0.6
ttl = 10 (10 secs)

------------

非权威应答:

------------
Got answer:
HEADER:
opcode = QUERY, id = 3, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 0, additional = 0

QUESTIONS:
portal.cloudpeter.com, type = AAAA, class = IN

------------
名称: portal.cloudpeter.com
Address: 172.16.0.6
```

#### Additional information
Overall architecture
User udp_port:53 -> adguardhome -> smartdns