I've created a test that takes an updated email address and joins it with an existing Salesforce contact. I create a journey that updates the email address via a Salesforce activity. The email does get updated in Sales Cloud for the contact. It then comes back in through the synchronized data extension and I do see that the change has been reflected in the sync DE. However, when I send to the filtered DE with the updated email, it still sends to the old email address.
I thought that once I sent to the new synced DE that the email would also be updated in all subscribers. I am using the right send relationship as well.
Did I miss a step here?