Extended DNS Error Code 6 - DNSSEC Bogus, when I am using Cloudflare resolver 1.1.1.1

I need help identifying a problem when using Cloudflare resolver 1.1.1.1
This is an intermittent problem and only happens in a percentage of queries.
First, I start getting the error: Extended DNS Error Code 6 - DNSSEC Bogus
So after some time, I start getting the error: Extended DNS Error Code 16 - Censored
After a few seconds, DNS is resolved again, but the errors happen again after a while
One of the domains I get this error is marketplace.ifood.com.br
These errors only occur when I use Cloudflare resolver

Below are some errors returned when I use the “dig marketplace.ifood.com.br” command

;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 38885
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 00 ("…")
; OPT=15: 00 06 ("…")
;; QUESTION SECTION:
;marketplace.ifood.com.br. IN A

;; Query time: 20 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Mon Jul 05 21:04:07 -03 2021
;; MSG SIZE rcvd: 65

; <<>> DiG 9.16.1-Ubuntu <<>> marketplace.ifood.com.br @1.1.1.1 +fail
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 22349
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 16 ("…")
;; QUESTION SECTION:
;marketplace.ifood.com.br. IN A

;; Query time: 0 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Mon Jul 05 21:01:10 -03 2021
;; MSG SIZE rcvd: 59

; <<>> DiG 9.16.1-Ubuntu <<>> marketplace.ifood.com.br @1.1.1.1 +fail
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 28412
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 00 ("…")
;; QUESTION SECTION:
;marketplace.ifood.com.br. IN A

;; Query time: 20 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Mon Jul 05 21:01:12 -03 2021
;; MSG SIZE rcvd: 59

Hi Giovani,

Thanks for the report, we are able see the errors on our side. It looks like something related to upstream ratelimiting, we’ll investigate it further.

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