Apex domains cannot have CNAME records.
Question and response
Question
dig b001.zw.tyo1.static.cnode.io. NS
Answer
b001.zw.tyo1.static.cnode.io. 1 NS ns-a1.conoha.io.
b001.zw.tyo1.static.cnode.io. 1 NS ns-a3.conoha.io.
b001.zw.tyo1.static.cnode.io. 1 NS ns-a2.conoha.io.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0