DNS Zone Manager and Zone Editor features allow duplicate DNS records to be added

Symptoms

When adding a duplicate DNS record, such as an "A" record, in "WHM / DNS Zone Manager" or "cPanel / Zone Editor", the record is added successfully. When checking a domains DNS zone via command-line, you may see errors similar to the following:

[root@server ~]cP# pdnsutil check-zone domain.tld
Feb 03 20:23:48 [bindbackend] Done parsing domains, 0 rejected, 16 new, 0 removed
[Error] Duplicate record found in rrset: 'domain.tld IN A 203.0.113.2'
[Error] Duplicate record found in rrset: 'domain.tld IN A 203.0.113.2'
Checked 32 records of 'domain.tld', 2 errors, 0 warnings.

Description

Duplicate DNS records in a domains DNS zone can result in zone errors.

We've opened an internal case for our development team to investigate this further. For reference, the case number is CPANEL-51385. Follow this article to receive an email notification when a solution is published in the product. 

Workaround

Remove the duplicate DNS records using WHM / DNS Zone Manager" or "cPanel / Zone Editor".