Regression: AD/LDAP directory user who is no longer in that directory cannot be removed from Project Role within a Project

Customers have reported that JRA-25220 is still occurring. I suspect there is an edge case that we missed.

User "A" was in the Role of Developer for a JIRA Project. User "A" was a user that came from an external AD/LDAP directory. When that user was removed from the AD/LDAP directory, the project manager tried to remove that user from the Developer Project Role w/in the Project. However JIRA puts up an error message that the user cannot be found and therefore cannot be removed from the Project Role.

Need to be able to remove users from Project Roles when they no longer exist in an external AD/LDAP directory.