Update custom field post-function adds an extra ‘\’ before the ‘[’

Issue Summary

The update custom field post function action adds an extra ‘{}’ before the ‘[’

Steps to Reproduce

• Create a Multi-Line Text custom field.
• Add a Post-Function to the workflow transition as Update Issue Custom Field and configure it as below:

• Transition the issue and the custom field would be updated as below:

Expected Results

The field value should get updated as appended [done]

Actual Results

The value gets updated as appended [done] instead of appended [done]

Workaround

By default, the renderer for the custom field is set as Default Text Renderer. By changing it to Wiki Style Renderer will not add the extra '{}' to the value.

Below are the steps:

• Select > Issues.
• Under FIELDS, select Field Configurations to view all your field configurations.
• Locate the field configuration of interest and click the Configure link to open the View Field Configuration page, which lists all system and custom fields in your Jira installation for that field configuration.
• In the Actions column, select Renderers and change the field's renderer.