Epic Panel/Labels not populated in backlog if board filter includes epic links

Summary

When viewing a board's backlog, the epic panel is not populated and no epic labels are shown if the board's filter includes Epic Link conditionals.

Steps to Reproduce

• Create a Scrum project with sample data (Test Project)
• Add two epics to the project (TP-24,TP-25)
• Associate issues in active sprint to these epics
• View backlog, see that epic panel is populated and epic labels are visible (Board > Show epic labels)
• Edit filter for board to specifically filter for issues contained in the two epics (project = TP AND "Epic Link" in (TP-24,TP-25) ORDER BY rank ASC)
• View backlog, observe that epic panel is blank and epic labels are NO LONGER present

Expected Results

Expect to see epic information in epic panel & epic labels for issues when viewing issues in backlog.

Actual Results

Epic data is omitted for the issues in the backlog, but is visible when viewing the active sprint.

Workaround

Explicitly add the epics to the board filter: project = TP AND ("Epic Link" in (TP-24,TP-25) OR issue in (TP-24,TP-25)) ORDER BY rank ASC