Custom Address Field Not Populating State in Record-Triggered Flow

I created a new address field under my opportunities so I could track shipping vs billing address. I have created a flow on the Opportunity object for when the shipping address is created / updated it automatically updates on the account level. Everything is working exactly as expected EXCEPT the state field.  

When I created my flow, I have it looking like this: 

Shipping City --> {!$Record.Shipping_Address__City__s}

ShippingStreet --> {!$Record.Shipping_Address__Street__s}

ETC 

However, for state it only allows me to choose {!$Record.Shipping_Address__State

Code

__s} from the opportunity record and not just the state {!$Record.Shipping_Address__State__s}.  

But when I do choose the state code value I get an error like the photo below when it's deployed. Can someone please help? I have been trying to figure this out for hours. I attached a photo of how I have it all set up.  

I am starting to think it's the custom address field that is creating this issue but i don't know any way around this.