Steps to reproduce:

1. Run any of the examples on https://docs.ansible.com/ansible/latest/modules/zabbix_action_module.html
2. Run the same example once more

Result:

First run creates the action item but the custom message (default_message and default_subject, ..) gets lost.

Second run fails with:

Error -32500: Application error., Cannot perform update statement on table \"actions\" without values.

Expected:
Idempotency in an ansible sense. The environment is the same we used with Zabbix 4.0 without any issues.