resolving yahoodns.net. fails

[Stephane Bortzmeyer]

On Tue, Apr 21, 2020 at 03:46:54PM +0200,
 Michael Ströder via Unbound-users <unbound-users at lists.nlnetlabs.nl> wrote 
 a message of 43 lines which said:

> Am I the only one seeing this issue?

Yes :-) My Unbound has no problem.

% dig NS yahoodns.net

; <<>> DiG 9.11.5-P4-5.1-Debian <<>> NS yahoodns.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12877
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 10

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
; COOKIE: 36e307658f7303dfc1ca2a965e9efdd2bca1f2ef71008c37 (good)
;; QUESTION SECTION:
;yahoodns.net.		IN NS

;; ANSWER SECTION:
yahoodns.net.		93412 IN NS ns4.yahoo.com.
yahoodns.net.		      93412 IN NS ns5.yahoo.com.
yahoodns.net.		      	    93412 IN NS ns1.yahoo.com.
yahoodns.net.			    	  93412 IN NS ns2.yahoo.com.
yahoodns.net.				  	93412 IN NS ns3.yahoo.com.

;; ADDITIONAL SECTION:
ns1.yahoo.com.		164424 IN A 68.180.131.16
ns2.yahoo.com.		       61959 IN A 68.142.255.16
ns3.yahoo.com.		       	     132058 IN A 27.123.42.42
ns4.yahoo.com.			     	    216224 IN A 98.138.11.157
ns5.yahoo.com.				    	   78031 IN A 202.165.97.53
ns1.yahoo.com.		86197 IN AAAA 2001:4998:130::1001
ns2.yahoo.com.		      61037 IN AAAA 2001:4998:140::1002
ns3.yahoo.com.		      	    1597 IN AAAA 2406:8600:f03f:1f8::1003
ns5.yahoo.com.		86197 IN AAAA 2406:2000:ff60::53

;; Query time: 112 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Apr 21 16:06:10 CEST 2020
;; MSG SIZE  rcvd: 573