Line Item Properties Not showing In Cart

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Hello.   I'm struggling to get the line item properties to show in the checkout and in print invoices.   I've followed the directions many times, but still can't get it to work.  I even tried to do it on a new project with the default template.   


As you can see in the screen, the 2 properties are there on the product page and inside of the <form> element.  


See product here:





I've also added the line item array in the cart template as shown on this help file:


But it isn't showing.   How do I troubleshoot this?   Is there another place to see the properties that are being included in the product line item?