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Answer

A mapped field is empty on some posts. What happens?

Updated Schema Pro 1.14.0Tested with WordPress 7.1

The property is omitted for those posts rather than output empty, which would be invalid. Where the field also has an automatic source — a headline, a date — that is used instead.

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Schema Pro

Mark up your pages so Google can show stars, prices, cook times and more, set up in two minutes with no code.

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The Edit Product schema screen of Schema Pro in WordPress admin. A schema named Products is active and applies to All Products. Its properties, such as Name and Description, say Filled automatically if left empty. On the right, a Search Preview shows a search result for Classic Sunglasses with a photo, $45, In stock and its description, and an Output Preview shows the JSON-LD with the product's name, SKU LF-AC-04, price 45 and currency USD.