Issue will not show in the Sprint board, when epic issue is linked to is not contained in the filter

[Kacper Wietrzny]

I have the following problem.

1. Epics are grouping issues from different projects in our projects.
2. Board filter is based on the projects, where actual issues are registered (Epics may come from other projects).
3. I am not able to add all projects, where Epics come from to the board filter, as JIRA requires myself to have 'Manage sprint' privilege in all these projects , so I can effectively handle my board - so I cannot really filter out additionally all epics linked to issues from my filter, as this will make my board unusable -> I will not be able to manipulate my sprint.
4. Finally, when issue is assigned to epic that is not picked by the board filter, the following will happen:
   1.  in the backlog view:
      1. epic does not show up,
      2. issue is visible, when I filter all issues,
      3. epic tag is visible on the card
   2. in the active sprint view, when I create swimlane from epics:
      1. issue simply disappears and IS NOT visible at all even as issue without epic!!!

In my opinion lack of visibility of such issue in an active sprint board is simply a bug as it should appear in section: Issues with no epics or perhaps (better) in additional section Issue with invisible epics - as it fulfills all requirements of issue visibility in a sprint board.

What do you think? I need to customize board filter a lot to pick projects from where my issues are currently assigned or I am not able to use epic as a swimlane effectively. :( :( :(