Summary

Adding request participants to the ticket will result in errors.

Steps to Reproduce

1. Create an issue
2. Add a Request participant and confirm.
3. Edit the "Request participant" and try saving again.

Expected Results

The field is successfully saved.

Actual Results

The following error appears:
Could not find usernames: $user.name

Notes

(Optional - If Necessary)

Workaround

Clearing the Request participant and adding everyone at once seems to work.