At the moment, when creating a JIRA Ticket from Salesforce, an error message will be shown if there is a "Required" field that does not have a value where it mentions that the field is required.
But, JIRA Workflow Validator is another place where we can set to check if a field doesn't have a value when a transition happens, including "Create" transition. At the moment, a generic "Error" message is shown instead of mentioning the validation error.
Hence, it will be great if the connector can capture such a message and show it on the Salesforce side as well. Reducing any confusion about what is the error can be.