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Google updated the documentation for potentialaction.target to clarify that they now expect an EntryPoint object with a urlTemplate property. They also note that they do still support the old 'shorthand' format of this property, which essentially matches their previous advice for validity.
Added general troubleshooting info to the Sitelinks search box documentation. Clarified that while Google Search may automatically display a search box scoped to your website, it's still helpful to explicitly provide information by adding WebSite structured data, which can help Google better understand your site.