Why does a newly created read-only field not appear in Jira issues?
Symptoms
You have created a read-only field:
After adding this field to a project, you expect it to appear in all relevant issues, but it doesn't.
Cause
A Connect field cannot populate itself, regardless of its type (read-only, autocomplete, select list).
Resolution
Any Connect field of any type (read-only, autocomplete, select list, etc.) must be set:
Either manually, via the edit/create/transition screens
Or automatically (using a post-function, automation rule or script):
To automatically update a Connect field in newly created issues, see: Automatically set the value of an Elements Connect field
To bulk update a Connect field in existing issues, see: How to set Elements Connect field on existing issues?