Overwrote a portal feature service to add a new feature class in the service. Update was successful, but the new feature class is missing in the map.

[MDB_GIS]

I know the update was successful because I can see the symbology changes that I made in the map. I can also see the new feature class that was added to the service on the REST service page. I made sure that the Layer IDs were correct and not conflicting before publishing so I know that there is no issue there. Any ideas on how to get the layer to show up? A few screenshots below:

An additional test was I just republished a test layer from scratch containing all 8 layers. When done that way, it shows up as expected with correct symbology. Using this is not ideal, however, as we have numerous maps and applications that are dependent upon this service so I really do not want to have to go and reconfigure every single map that utilizes these layers. 

[DEWright_CA]

You will need to go into the WebMap and add the new layer from the AGS service; these do not automatically update when you update a nested/reference service.

You can either remove and readd the service, or browse to that layer in the AGS restendpoint, copy the URL for that layer then add it as a separate reference to your WebMap.

[MDB_GIS]

The item is missing on the feature service page itself, however. Not just the web map. 

I need the feature layer to update because this service is being passed through to AGOL via URL with stored credentials. So if it won't show up on the feature service, there is no way to get it to show up in AGOL.