machines.dev DNS gets SERVFAIL from 1.1.1.1

[Tv1]

Something’s wrong with how api.machines.dev DNS is set up:

dig api.machines.dev @1.1.1.1

; <<>> DiG 9.18.16 <<>> api.machines.dev @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 4880
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; EDE: 22 (No Reachable Authority): (at delegation machines.dev.)
; EDE: 23 (Network Error): ([2400:cb00:2049:1::a29f:1b04]:53 rcode=SERVFAIL for ns1.flydns.io A)
;; QUESTION SECTION:
;api.machines.dev.		IN	A

;; Query time: 136 msec
;; SERVER: 1.1.1.1#53(1.1.1.1) (UDP)
;; WHEN: Sat Sep 16 10:46:48 MDT 2023
;; MSG SIZE  rcvd: 151