Why does a Rename policy fire upon adding a new member?

Summary:

Why does a Rename Description filtered policy fire upon adding a new member? My client is wondering why a property update policy fires when they add a new member.

Thanks,

Daniel

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Version 23.12.51

Code Snippet (add any code snippets that support your topic, if applicable):