Apex domains cannot have CNAME records.
Question and response
Question
dig ist.lt. NS
Answer
ist.lt. 5 NS dns2.bacloud.com.
ist.lt. 5 NS dns1.bacloud.com.
ist.lt. 5 NS dns1.laisvas.lt.
ist.lt. 5 NS dns2.laisvas.lt.
Authority
The response has no authority records.
Additional
dns1.laisvas.lt. 5 A 85.206.161.172
dns2.laisvas.lt. 5 A 5.178.66.157
dns1.laisvas.lt. 5 AAAA 2a04:2180:dc05:2:0:0:0:dd5
dns2.laisvas.lt. 5 AAAA 2a00:1ca8:81:0:0:0:101:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0