We use an issue status called "Ready for Estimation" that happens before our To Do transition. When stories are set to this status, they do not show up under the Epic in the backlog when you select that Epic.
If click into the Epic details you can see the issues are part of the epic with the Ready for Estimation status but in the backlog view they do not show up.
How does Jira filter issues in the backlog when selecting an epic in the backlog?