Current behavior:

LDAP users that are deleted from LDAP side will be removed in Confluence user cache after a synchronization.

This causes incident where content that was created by these users will be displayed to be created by "Unknown User":

Desired behavior:

It will be great to not remove these users in the Confluence user cache, once these users have created content.

Suggestion:
As per behavior in JIRA, it'll be great if these users are displayed as deactivated users instead