Apex domains cannot have CNAME records.
Question and response
Question
dig besmegeniai.lt. NS
Answer
besmegeniai.lt. 5 NS u4.domains.lt.
besmegeniai.lt. 5 NS u2.domains.lt.
besmegeniai.lt. 5 NS u1.domains.lt.
besmegeniai.lt. 5 NS u3.domains.lt.
besmegeniai.lt. 5 NS nsa.domreg.lt.
Authority
The response has no authority records.
Additional
nsa.domreg.lt. 5 A 185.150.42.1
nsa.domreg.lt. 5 AAAA 2a07:ab42:0:0:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0