Cannot resolve an internal IP via NextDNS

I'm having trouble resolving an internal IP via NextDNS as follows:

$ dig librenms.uk.easy-server.com

; <<>> DiG 9.10.6 <<>> librenms.uk.easy-server.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47319
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 0f ("..")
;; QUESTION SECTION:
;librenms.uk.easy-server.com. IN A

;; Query time: 119 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Tue Oct 03 18:21:04 BST 2023
;; MSG SIZE  rcvd: 62

This is resolvable via other resolvers. E.g. Cloudflare:

$ dig librenms.uk.easy-server.com @1.1.1.1

; <<>> DiG 9.10.6 <<>> librenms.uk.easy-server.com @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7292
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;librenms.uk.easy-server.com. IN A

;; ANSWER SECTION:
librenms.uk.easy-server.com. 600 IN A 10.68.25.12

;; Query time: 825 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Tue Oct 03 18:24:18 BST 2023
;; MSG SIZE  rcvd: 72

At first I figured it was getting blocked due to the DNS Rebinding Protection feature, but that's disabled in my profile + when I enable it I can see the query is blocked in NextDNS logs (whilst it looks normal in my logs otherwise).

Here's an example of how it looks via dig when that feature is enabled:

$ dig librenms.uk.easy-server.com

; <<>> DiG 9.10.6 <<>> librenms.uk.easy-server.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45118
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 11 42 6c 6f 63 6b 65 64 20 62 79 20 4e 65 78 74 44 4e 53 ("..Blocked by NextDNS")
;; QUESTION SECTION:
;librenms.uk.easy-server.com. IN A

;; ANSWER SECTION:
librenms.uk.easy-server.com. 300 IN A 0.0.0.0

;; Query time: 43 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Tue Oct 03 18:26:36 BST 2023
;; MSG SIZE  rcvd: 96

Any idea why I can't resolve this record via NextDNS?