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Streaming metadata wrapper uses <div> causing hydration deletion when third-party prepends same tag
Next.js Streaming Metadata renders a <div hidden> as the first child of <body>. React 19 hydration matches only by tag name and claims any prepended <div> (e.g. consent manager or chat widget) as the metadata wrapper. Hydration then fails with Minified React error #418, and React's clearContainerSparingly removes the third-party DOM node.