VPN SS Google cannot be accessed, DNS pollution

ss + chinadns + DNS-Forwarder
All is working, google.com.hk is accessible, google.com is not.

dig google.com

; <<>> DiG 9.10.6 <<>> google.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52526

;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 512

;; QUESTION SECTION:

;google.com. IN A

;; ANSWER SECTION:

google.com. 193 IN A 172.217.161.174

;; Query time: 87 msec

;; SERVER: 192.168.8.1#53(192.168.8.1)

;; WHEN: Mon May 20 14:13:10 CST 2019

;; MSG SIZE rcvd: 55