Short answer: restore the hostname by removing the newly introduced CNAME or the other data at the same owner name, then wait for authoritative answers to become internally consistent before resuming the cutover. A CNAME is an alias boundary: except for DNSSEC-related records, it cannot coexist ...
Source: [Dev.to](https://dev.to/quintonshaw1483/logistics-hostname-broke-after-adding-an-alias-dns-cutover-constraint-elp)