[dns-operations] is glue expected in this case?

[Veaceslav Revutchi]

When I send this query to any afilias servers the response includes
the A record for the name server in the org tld.

; <<>> DiG 9.11.3-1ubuntu1.2-Ubuntu <<>> @2001:500:f::1
adaptation-fund.org +norec +noall +auth +add
; (1 server found)
;; global options: +cmd
adaptation-fund.org. 86400 IN NS ns-152.awsdns-19.com.
adaptation-fund.org. 86400 IN NS ns-890.awsdns-47.net.
adaptation-fund.org. 86400 IN NS ns-1281.awsdns-32.org.
adaptation-fund.org. 86400 IN NS ns-1768.awsdns-29.co.uk.
ns-1281.awsdns-32.org. 86400 IN A 205.251.197.1

I would expect this glue to be present at the tld if
ns-1281.awsdns-32.org was one of the name servers for awsdns-32.org
which is not the case. Is there another reason for this record to be
kept in the org zone?