腾讯云服务器的 53 端口是被劫持的吗？

想建一个自用的 DNS 服务器，配置好以后在本服务器上用 dig @122.my.dns.ip test.cn 测试，DNS 解析如预期进行(123.1.1.1)：

root@ubuntu-shanghai:~# dig @122.xx.xx.xx www.baidu.com

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> @122.xx.xx.xx www.baidu.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2438
;; flags: qr aa rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.baidu.com.                 IN      A

;; ANSWER SECTION:
www.baidu.com.          0       IN      A       123.1.1.1

;; Query time: 0 msec
;; SERVER: 122.xx.xx.xx#53(122.xx.xx.xx)
;; WHEN: Wed Feb 19 19:21:42 CST 2020
;; MSG SIZE  rcvd: 47

但是在自己电脑上用同样的命令，解析结果却和普通公共 DNS 一样(没有 123.1.1.1)：

mashiro@Mashiro:~$ dig @122.xx.xx.xx www.baidu.com

; <<>> DiG 9.11.3-1ubuntu1.2-Ubuntu <<>> @122.xx.xx.xx www.baidu.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59985
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; QUESTION SECTION:
;www.baidu.com.                 IN      A

;; ANSWER SECTION:
www.baidu.com.          208     IN      CNAME   www.a.shifen.com.
www.a.shifen.com.       40      IN      A       183.232.231.174
www.a.shifen.com.       40      IN      A       183.232.231.172

;; ADDITIONAL SECTION:
ns.serverflag.          3600    IN      A       127.0.0.1

;; Query time: 8 msec
;; SERVER: 122.xx.xx.xx#53(122.xx.xx.xx)
;; WHEN: Wed Feb 19 19:22:05 CST 2020
;; MSG SIZE  rcvd: 119

看到腾讯的一条通知： https://cloud.tencent.com/document/product/213/35533

一两年前也在腾讯云上搭过 DNS，当时是可以的，不知这次是被劫持了还是我配置不当？

望有类似经验的能指点一二.