Changing user Display Name does not update Projects Gadget

Steps to Reproduce

1. Create user 'Admin' with display name 'F Bloggs'
2. Create project 'Project 1'
3. Assign 'Admin' as project lead (role) of 'Project 1'
4. Add 'Projects Gadget' to dashboard, leave 'Projects' setting as "All Projects" and confirm 'F Bloggs' is displayed as Lead under 'Project 1'
5. Edit 'Admin' user display name to 'Freddy B'

Expected Results

Projects gadget should reflect the name change for the 'Lead' role. 'Freddy B' should be shown.

Actual Results

Project gadget still displays 'F Bloggs' as the 'Lead' role. Deleting and re-adding does not correct behaviour.

Workaround

Navigate to 'Project 1' administration, and change the Project Lead role from 'Admin' user to another user, and then change back. Save changes, and refresh Projects gadget. New username should now be displayed.

Alternative Workaround:
Restarting JIRA also appears to correct this issue