Renaming a user profile wipes all users activities

Our user accounts are created by oidc with the scheme “FirstnameLastname”. One user changed the lastname. The profiles lastname did change to the new lastname and the changed email is correct too.

But the account stays XWiki.FirstnameOldlastname. So I renamed the page to XWiki.FirstnameNewlastname.

Now there are no activities from this account. I expected that the activities (article created, edited etc.) were kept.