Salesforce Last Activity Field Not Updated For All Contact Records Using Outlook and Gmail Integration's Log Email Action

When the Activity Setting "Allow Users to Relate Multiple Contacts to Tasks and Events" is enabled and there are multiple Contacts related to a single email message or task record, it is expected behavior to not see all related Contacts records reflecting an updated Last Activity field value.  Due to database factors, we need to determine the Primary Contact to relate the records correctly.  The Primary Contact cannot be selected during the Log Email process and therefore the related record is arbitrary and causes this discrepency.

When the previously mentioned Activity Setting feature is enabled, which allows the user to relate multiple Contacts to a Task/Event, only one Contact record has the Last Activity field updated (Let's refer to this Contact as the Primary Contact).

For example: If a user logs an email, and relates it to 4 Contact records, only one of those Contacts is the Primary Contact.