Issue Summary

Two Dimensional Filter Statistics gadget, using "Parent" as YAxis, "Sort By Natural" does not work.
It sorted by Parent key order.

Steps to Reproduce

1. Create Company-managed project
2. add Parent issue types(example "Initiative and Epic", "Epic and Story", "Task and Subtask")
3. create issues, add "Parent" in some issues
   1. example issues

      Issue key	summary	Issue type	Parent
      test-1	2-initiative	Initiative
      test-3	Epic	Epic	test-1
      test-4	Epic	Epic
      test-11	1-initiative	Initiative
      test-12	Epic	Epic	test-11

1. In Dashboard, add "Two Dimensional Filter Statistics" and set configuration
   1. X Axis: Status
   2. Y Axis: Parent
   3. Sort By Natural
   4. Sort Direction: Ascending
   5. Save

Expected Results

Parent should be sorted by number and alphabet.
In this example, "1-inititive" should be upper of "2-initiative"

Actual Results

It is sorted by "Parent key" order.
"test-1"(2-initiative) shows upper than "test-11"(1-initiative).

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available