I have the 'linked issues' field added to all the operation screens (Create, Edit and View) for an issue type in my project, from the Project Settings > Screens. But the field does not appear on any of these screens. In fact, doing a 'Find my field' when trying to create an issue even reports everything as fine (screenshot below). 
Looking further, came across some suggestions to ensure that it is also configured against the issue type from Project Settings > layout for the new Jira views. But unfortunately, here the 'linked issues' is not even available in the field list. Is this a bug or am I missing something?