On Mon, Jun 10, 2019 at 02:28:46PM +0000,
 Jukka Pakkanen <jukka.pakka...@qnet.fi> wrote 
 a message of 382 lines which said:

> An example, the client domain is raimoasikainenoy.fi.

dig clearly says it's a cookie issue:

% dig @193.184.54.212 NS raimoasikainenoy.fi

;; Warning: Client COOKIE mismatch

An DNSviz confirms:

http://dnsviz.net/d/raimoasikainenoy.fi/dnssec/

Your tests show that it fails only when you use cookies, which is
consistent with the above:

> ; <<>> DiG 9.14.2 <<>> @ns1.qnet.fi raimoasikainenoy.fi ns
...
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 4096
> ; COOKIE: 55ba199a6d905273458bc2065cfe655462f150936d882603 (good)

> ; <<>> DiG 9.14.2 <<>> @8.8.8.8 raimoasikainenoy.fi ns
...
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 512

(Bad Google, no cookies)

So, they have broken authoritative name servers.

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