ScriptRunner/JMWE/other apps regex validator for certain rich-text custom fields fails on the new Global Issue Create modal

Issue Summary

User is unable to create issues on the new Global Issue Create modal using ScriptRunner workflow validator for multi-line text field

Steps to Reproduce

1. Install script runner for the instance
2. Create a custom multi-line text custom field
3. Add "Script Runner" Validator for this field using Jira expression on the create transition
   e.g issue.customfield_<ID>.replace('\n','Text')
4. Open the new Global Issue Create modal and fill in some values and click on submit - we will get a validation error
5. Try on the old issue create modal - we can create an issue

Root Cause

This happens for the Multi-Line Text custom fields: Multi-Line Text Field, Message Edit Field due to the following reason:

REST v3 API for Issue Submit uses ADF format while REST v2 API for Issue Submit uses Plain String format based on Wiki Markup for the multi-line text field. The workflow validators based on multi-line text fields are unable to parse the text from the ADF representation due to these format changes. This in turn causes the validators to fail. Hence users are unable to create issues.

Hence the Jira Expression framework used by the ScriptRunner does not work as intended.

Expected Results

The issue can be created on the new Global Issue Create modal.

Actual Results

We can not create an issue in the new Global Issue Create modal.

Workaround

Use Single line text field instead

Fix for the issue

Users may need to make modifications to their workflow validators set up on multi-line text fields.

We've pushed out changes on the Jira Expressions framework: Working with JSON and RichText constructor from ADF Map as well as the changelog entries on the Jira Platform Developer portal to support these changes.

Users on the old Global Issue Create modal can make changes to their existing workflow validators and then test out the changes by enabling the switch to the new Global Issue Create located under Settings > Personal Jira Settings.