Apex domains cannot have CNAME records.
Question and response
Question
dig lh.pl. NS
Answer
lh.pl. 5 NS ns.lh.pl.
lh.pl. 5 NS ns2.lh.pl.
lh.pl. 5 NS ns3.lh.pl.
Authority
The response has no authority records.
Additional
ns.lh.pl. 5 A 3.67.205.197
ns.lh.pl. 5 A 3.76.92.90
ns2.lh.pl. 5 A 18.198.204.241
ns2.lh.pl. 5 A 52.57.104.17
ns3.lh.pl. 5 A 185.135.88.199
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0