first item in a list isn't output correctly

After looking at this a bit it's still outputting incorrectly, the eligibleRegion should have had a Country subelement.

Turning off pivoting outputs as expected:

{
    "@context": "https://schema.org",
    "@graph": [
        {
            "@type": "Product",
            "name": "Thing",
            "offers": {
                "@type": "Offer",
                "price": "500",
                "eligibleRegion": {
                    "@type": "Country",
                    "name": "USA"
                }
            }
        }
    ]
}