Test Studio not saving friendly names when gathering Performance Data for web tests

Here are the steps to reproduce. Issue affects Test Studio version 2.1420

1. open a web test
2. click 'performance' tab
3. click 'configure' in 'set up' panel
4. go to step 2
5. add a computer to gather data from
6. set a 'friendly name' and click 'done editing' and then 'save'
7. click 'configure' in 'set up' panel again
8. the friendly names are not saved