`+server.ts` route inside `.well-known` is not type-checked

Describe the bug

I have a +server.ts file here src/routes/(search_engines)/.well-known/assetlinks.json/+server.ts.

It's contents are not correctly typechecked.
Neither by my LSP, nor by pnpm run check.

As you can see inside my editor it does not interpret the contents correctly. Which is weird, because inside the "neighbouring file" src/routes/(search_engines)/robots.txt/+server.ts everything is typechecked as expected.

Not only imports are affected, but also pain syntax errors, such as using a variable that was never defined.

Reproduction

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Logs

System Info

System:
    OS: macOS 15.5
    CPU: (20) x64 Intel(R) Xeon(R) W-2150B CPU @ 3.00GHz
    Memory: 792.44 MB / 64.00 GB
    Shell: 3.2.57 - /bin/bash
  Binaries:
    Node: 24.5.0 - /usr/local/bin/node
    Yarn: 1.22.11 - /usr/local/bin/yarn
    npm: 11.5.1 - /usr/local/bin/npm
    pnpm: 10.13.1 - /usr/local/bin/pnpm
    bun: 1.0.25 - /usr/local/bin/bun
  Browsers:
    Chrome: 138.0.7204.184
    Safari: 18.5
  npmPackages:
    @sveltejs/adapter-node: ^5.2.13 => 5.2.13 
    @sveltejs/adapter-static: ^3.0.8 => 3.0.8 
    @sveltejs/enhanced-img: ^0.6.1 => 0.6.1 
    @sveltejs/kit: 2.27.0 => 2.27.0 
    @sveltejs/vite-plugin-svelte: ^6.1.0 => 6.1.0 
    svelte: 5.37.3 => 5.37.3 
    vite: ^7.0.6 => 7.0.6

Severity

serious, but I can work around it

Additional Information

No response

Start by comparing type-checking for src/routes/(search_engines)/.well-known/assetlinks.json/+server.ts with the neighboring src/routes/(search_engines)/robots.txt/+server.ts. Run pnpm run check and inspect the generated or checked route information for both files. Done means imports, undefined variables, and other TypeScript errors in the assetlinks route are reported correctly.