Tasks within an Epic are not showing in my backlog

[Corey Schmidt]

I recently moved many of our "classic" projects to the "next-generation" projects and am now noticing that tasks/issues/stories that are assigned to an epic, are not showing in the backlog, but rather, only the epics are. I have many epics that are larger than one single sprint, and would like to only pull certain issues into a given sprint, rather than the entire epic; however, it's only given me the option to pull the epic into the sprint. 

To clarify, I am using a filter to view ALL issues from ALL projects in Jira. I can view the issues on the project specific backlog, but not in my filter. I view them this way, because I have a pool of devs that are not dedicated to a single project, and it's nice to be able to view all the tasks I need done from multiple projects within a given sprint, rather than at the project specific level. 

I don't believe it's a query issue, as other tasks from other projects are showing; the only differentiator here is that tasks within an epic do not show. 

Any help would be greatly appreciated. 

[Rex Lorenzo]

I am also running into this issue when I am trying to show issues from both a classic and next-gen project in the same backlog.

I am in the classic backlog and I can see next-gen issues if they are not associated with an Epic. But when they are associated with an Epic the backlog treats them as a sub-task and on reload it hides that issue from view.

This must be a bug, right? Two project types should be able to work together right? Or do need to convert them both to classic or next-gen? Or is there a workaround?