Bug: [React 19 | Streaming SSR] Script tags injected via ChunkExtractor not appearing in final HTML when using renderToPipeableStream

Description I am using React 19, Express, and Streaming SSR (renderToPipeableStream) along with @loadable/server ChunkExtractor to extract and inject script/style tags for client-side hydration. The loadable-stats.json is generated correctly, and ChunkExtractor.getScriptTags() returns the expected <script> tags. However, when I inject these <script> tags inside the onAllReady() callback of renderToPipeableStream, they never appear in the final browser HTML output. This results in no client bundle being loaded and therefore hydration never occurs. This issue happens even though: Scripts are extracted correctly onAllReady() is called res.write(scripts) is executed SSR output is streamed successfully React version: 19.2.0 ## Steps To Reproduce https://github.com/sandeep3690Butte/node-r19-ssr 1.git clone [<repo>](https://github.com/sandeep3690Butte/node-r19-ssr) 2.yarn install 3.yarn build 4.yarn start 5.Open the SSR page → scripts do not appear in view-source or DevTools Network panel. Repository Structure client/ → all client React code server/ → Express SSR server webpack.* → server/client configs for dev + prod ## The current behavior The onAllReady() callback is triggered correctly res.write() executes with no error But no script tags appear in the final HTML Client JS never loads, causing hydration to never run No errors in server logs or browser console ## The expected behavior The <script> tags returned by ChunkExtractor.getScriptTags() should be written to the response in onAllReady() so they load the client bundles required for hydration.