NOTE:
This problem has already been stated in at least 3 issues in the old repo:

ansible/ansible#69621
ansible/ansible#33193
ansible/ansible#66170

There are tentative addressing this problem in the past issues but there is no idempotent solution AFAIK.

SUMMARY

The problem itself:
You should be able to append values to a record or to substitute it if the record already exist.
I.E. Tipically an SRV or a MX record will contain many values and those values may change during time.

ISSUE TYPE

• Bug Report

COMPONENT NAME

ipa_dnsrecord

ANSIBLE VERSION

ansible 2.9.9
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.6/site-packages/ansible
  executable location = /bin/ansible
  python version = 3.6.8 (default, Dec  5 2019, 15:45:45) [GCC 8.3.1 20191121 (Red Hat 8.3.1-5)]

CONFIGURATION

[root@bastion ~]# ansible-config dump --only-changed
[root@bastion ~]#

OS / ENVIRONMENT

# cat /etc/redhat-release
Red Hat Enterprise Linux release 8.2 (Ootpa)

STEPS TO REPRODUCE

• Create an SRV record
• Add a value to the same record

EXPECTED RESULTS

• You should have two record or one based on a switch that provide if the record should be replaced or appended.

ACTUAL RESULTS

• The record is updated