Issue Summary

When moving an Epic with 11 subtasks from one project to another, one of the subtasks does not move to the target project.

This is reproducible on Data Center: Yes

Steps to Reproduce

1. Create two projects (ProjectA and ProjectB)
2. Create an Epic under ProjectA
3. Create 11 subtasks under the epic
4. Move the Epic to ProjectB

Expected Results

All subtasks moves to the projectB

Actual Results

11th subtask does not move to the ProjectB

• The problem occurs only when epic has 11 Subtasks
• Tested with 10 or 12 subtasks and it works fine

The below message maybe thrown in the atlassian-jira.log file:

/secure/views/bulkedit/BulkOperationFinish.jspa; user: admin WARN admin 749x2461x1 5qups8 172.29.216.176,10.224.217.132 /secure/views/bulkedit/BulkOperationFinish.jspa [c.a.j.w.a.issue.bulkedit.BulkOperationProgress] Bulk edit bean unexpectedly null. Perhaps session was lost (e.g. when URL used is different to base URL in General Configuration)?

Workaround

After moving the Epic fromProjectA to ProjectB, move same the Epic from ProjectB to ProjectB