Apex domains cannot have CNAME records.
Question and response
Question
dig miuku.net. NS
Answer
miuku.net. 5 NS a.miuku.net.
miuku.net. 5 NS b.miuku.net.
Authority
The response has no authority records.
Additional
a.miuku.net. 5 A 95.217.203.53
b.miuku.net. 5 A 94.237.125.46
a.miuku.net. 5 AAAA 2a01:4f9:4a:460a:0:0:0:2
b.miuku.net. 5 AAAA 2a04:3544:1000:1510:d862:f5ff:fe4e:5c32
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0