Apex domains cannot have CNAME records.
Question and response
Question
dig bunnyinfra.net. NS
Answer
bunnyinfra.net. 5 NS coco.bunny.net.
bunnyinfra.net. 5 NS kiki.bunny.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0