Inline page metadata overwritten by layout metadata

### Link to the code that reproduces this issue https://codesandbox.io/p/devbox/repro-next-layout-metadata-hxmpxr ### To Reproduce 1. Have a fallback metadata set in your layout 2. Set custom inline metadata using React 19's metadata hoisting 3. Visit the root page directly (the title says "Metadata: Root Layout" instead of "Metadata: Page") 4. Navigate to test page & back using the link, now the title is correctly set ### Current vs. Expected behavior The inline metadata, which get hoisted by react (since React 19), gets overwritten by the static metadata from the layout. This only happens on an initial page visit (but impacts SEO), when routing between pages the metadata is correctly set As the page metadata is lower in the hierarchy that the layout metadata, I would expect to have the page metadata to have priority over the layout metadata ### 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: 22.12.0 npm: 10.9.0 Yarn: 1.22.22 pnpm: N/A Relevant Packages: next: 15.2.4 // Latest available version is detected (15.2.4) 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) Metadata ### Which stage(s) are affected? (Select all that apply) next dev (local), next build (local) ### Additional context _No response_