dns.spoof error serializing packet: serializing resource record of type Unknown not supported.

[acheong08]

Environment

Please provide:

• bettercap v2.29 (built for darwin amd64 with go1.15.6)
• Darwin Example.local 20.3.0 Darwin Kernel Version 20.3.0: Thu Jan 21 00:07:06 PST 2021; root:xnu-7195.81.3~1/RELEASE_X86_64 x86_64
• go version go1.16 darwin/amd64
• sudo bettercap -iface en0
• Terminal

Steps to Reproduce

1. set dns.spoof.domains example.com
2. set dns.spoof.address 172.20.10.16
3. dns.spoof on
4. Visit example.com with safari

Expected behavior:

Redirect to 172.20.10.16

--
What happened
When visiting with Safari

172.20.10.0/24 > 172.20.10.14  » dns.spoof off
172.20.10.0/24 > 172.20.10.14  » dns.spoof on
[16:28:30] [sys.log] [inf] dns.spoof example.com -> 172.20.10.16
[16:28:30] [sys.log] [inf] dns.spoof enabling forwarding.
172.20.10.0/24 > 172.20.10.14  » [16:28:36] [sys.log] [inf] dns.spoof sending spoofed DNS reply for example.com (->172.20.10.16) to 172.20.10.14 : f8:ff:c2:3e:20:f0.
172.20.10.0/24 > 172.20.10.14  » [16:28:49] [sys.log] [err] error serializing packet: serializing resource record of type Unknown not supported.
172.20.10.0/24 > 172.20.10.14  » [16:28:49] [sys.log] [inf] dns.spoof sending spoofed DNS reply for example.com (->172.20.10.16) to 172.20.10.14 : f8:ff:c2:3e:20:f0.
172.20.10.0/24 > 172.20.10.14  » [16:28:49] [sys.log] [err] error serializing packet: serializing resource record of type Unknown not supported.

However, it works when using the dig command

 $ dig example.com

; <<>> DiG 9.10.6 <<>> example.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37714
;; flags: qr; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;example.com.			IN	A

;; ANSWER SECTION:
example.com.		1024	IN	A	172.20.10.16

;; Query time: 24 msec
;; SERVER: 172.20.10.16#53(172.20.10.16)
;; WHEN: Tue Mar 09 16:33:48 CST 2021
;; MSG SIZE  rcvd: 56

172.20.10.0/24 > 172.20.10.14 » [16:33:48] [sys.log] [inf] dns.spoof sending spoofed DNS reply for example.com (->172.20.10.16) to 172.20.10.14 : f8:ff:c2:3e:20:f0.