Unable to use custom renderers on server

### Link to the code that reproduces this issue https://github.com/Inbestigator/rr-next-repro ### To Reproduce 1. Start the application in dev 2. Go to `/` 3. View the console output ### Current vs. Expected behavior Currently Next seems to be causing `React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE` to be `undefined`, instead it should be an object like this: ```ts { H: null, A: null, T: null, S: null, V: null, actQueue: null, isBatchingLegacy: false, didScheduleLegacyUpdate: false, didUsePromise: false, thrownErrors: [], getCurrentStack: null, recentlyCreatedOwnerStacks: 0, } ``` ### Provide environment information ```bash Operating System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 25.0.0: Wed Aug 27 20:24:40 PDT 2025; root:xnu-12377.1.9~17/RELEASE_ARM64_T8122 Available memory (MB): 16384 Available CPU cores: 8 Binaries: Node: 24.1.0 npm: 11.3.0 Yarn: 1.22.22 pnpm: N/A Relevant Packages: next: 15.5.1-canary.30 // Latest available version is detected (15.5.1-canary.30). eslint-config-next: N/A react: 19.1.1 react-dom: 19.1.1 typescript: 5.9.2 Next.js Config: output: N/A ``` ### Which area(s) are affected? (Select all that apply) Server Actions ### Which stage(s) are affected? (Select all that apply) next dev (local), next start (local), Vercel (Deployed), Other (Deployed) ### Additional context [`react-reconciler`](https://www.npmjs.com/package/react-reconciler) requires `React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE` to work. This means that any custom renderers (like my [Discord bot component renderer](https://github.com/inbestigator/dressed/tree/main/packages/dressed-react/)) running on the server are incapable of working.