Apex domains cannot have CNAME records.
Question and response
Question
dig krystal-hosting.katapult.cloud. NS
Answer
krystal-hosting.katapult.cloud. 5 NS dazzling-vista.katapultdns.com.
krystal-hosting.katapult.cloud. 5 NS green-cheetah.katapultdns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0