Server action redirect drops #hash in URL

### Link to the code that reproduces this issue https://github.com/kachkaev/next.js-server-action-redirect-url-hash-mwe ### To Reproduce 1. Run `npm install; npm run dev` 1. Open http://localhost:3000 1. Press a button to trigger a server action. It should redirect to `/example?hello=world#hash` 1. Observe new URL in the browser ### Current vs. Expected behavior Currently, new URL is `http://localhost:3000/example?hello=world` but it should be `http://localhost:3000/example?hello=world#hash`. ### Provide environment information ```bash Operating System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 24.3.0: Thu Jan 2 20:24:16 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6000 Available memory (MB): 32768 Available CPU cores: 10 Binaries: Node: 22.13.1 npm: 10.9.2 Yarn: N/A pnpm: 10.1.0 Relevant Packages: next: 15.3.0-canary.6 // Latest available version is detected (15.3.0-canary.6). eslint-config-next: N/A react: 19.0.0 react-dom: 19.0.0 typescript: 5.8.2 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) ### Additional context Received `x-action-redirect` header contains `/example?hello=world#hash;push`, so the `#hash` is transmitted to the client.