Summary:

It is no longer possible to select Scripted fields as source fields in the Copy Fields Values built-in script

Problem:

It was previously possible to copy from scripted fields to non-scripted fields. e.g. like scripted DateTime field to a Custom Jira Date Field.

We now filter out Scripted fields from both source and target field selections because you should not copy to the Scripted fields that do not accept user input.

However, this needs to be refined to allow users to copy FROM Scripted Fields to Non-scripted fields and only prevent the targets from being scripted fields.

Except for Scripted Picker fields, as these are also valid target fields.