Apex domains cannot have CNAME records.
Question and response
Question
dig miran.tech. NS
Answer
miran.tech. 1 NS ns.miran.ru.
miran.tech. 1 NS ns1.miran.ru.
Authority
The response has no authority records.
Additional
ns.miran.ru. 1 A 91.142.80.2
ns1.miran.ru. 1 A 91.142.86.5
ns.miran.ru. 1 AAAA 2a03:21c0:1:1:0:0:0:53
ns1.miran.ru. 1 AAAA 2a03:21c0:1:2:0:0:0:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0