Two Dimensional Filter Statistics gadget not showing certain users from a Team Managed project People Field

Issue Summary

Two-Dimensional Filter Statistics gadget not showing certain users when grouped by a Team Managed People Field.

Steps to Reproduce

1. Create a People type field in a Team Managed project
2. Select people in the new field
3. Create a Filter that includes the issue (to be used in the gadget).
4. On an existing/new dashboard add the Two Dimensional Filter Statistics gadget and configure it with your filter and select the people type field in any of the axis
5. Save settings. 

Expected Results

Two Dimensional Filter Statistics gadget to show all the users selected in the field 

Actual Results

Two Dimensional Filter Statistics gadget is not showing all the selected users in the field 

Workaround

1. Create a User Picker Global Custom Field in Settings>Issues>Custom Fields
2. Go to the issue view and click configure on the bottom right corner or go to Project Settings>Issue Types> Select Issue Type.
3. From the right panel go to the "Search field" and add the User Picker Global Custom Field.
4. Group the Two Dimensional Filter Statistics gadget with that field

Additional Notes:

Unable to establish a difference between the users shown and the users that are not being shown, tested:

• Unmanaged vs Managed: same domains.
• Unmanaged vs Managed: different domains
• Verified vs unverified accounts