One of our team members contacted me with that issue:
He created an Epic and a bunch of child issues in it (bugs/regressions/etc).
Once another team member changed the issue type of that Epic to Story, the linked issues section appeared empty and all the links between this ex-epic and created child issues disappeared.
The question: is it expected behavior in JIRA Cloud? And if yes, how this situation could be prevented in the future? Is there a way to auto-link issues/tasks in epic to a child on JIRA side or so?
Thank you in advance,
Maksim