Epic burndown doesn't show issues where the epic link field hasn't changed

Issue Summary

Issues that are created with an epic link at creation time won't show in the epic burndown report.

Steps to Reproduce

1. Create issues and set epic link at creation time to "Epic A" for instance.
2. Add those issues in a sprint called "Sprint 1".
3. Start and complete "Sprint 1".
4. Open the Epic Burndown report for "Epic A".

Expected Results

All issues that have Epic Link set to "Epic A" should appear under "Sprint 1".

Actual Results

Only the issue that have a change history item where Epic Link has changed will appear under the sprint in Epic Burndown.

Workaround

Clearing the setting the Epic Link will make the issue appear. This will fix existing issues.

For issues to be created in the future:

• The Epic Link should be removed from the Issue Create screen.
• The users should be educated not to clone issues.

Notes

The problem doesn't impact Epic Report.