ns.anycastcluster.com has no CNAME records.
Question and response
Question
dig ns.anycastcluster.com. NS
Answer
The response has no answer records.
Authority
anycastcluster.com. 8855 SOA ns.nscluster.eu. hostmaster.nscluster.eu. 2026022601 7200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0