Hash router logs “Empty string passed to getElementById()” on navigation

[lemmon]

Describe the bug

With router: { type: 'hash' } enabled, navigating between routes triggers a browser console warning: Empty string passed to getElementById(). My guess: the hash-based router is conflicting with the built-in scroll/anchor handling and trying to apply both hash navigation and scroll-to-anchor, leading to a getElementById('') call.

Reproduction

1. Create a new SvelteKit project (e.g., npx sv create) and enable router: { type: 'hash' } in svelte.config.js (with adapter-static fallback).
2. Add two routes: src/routes/+page.svelte and src/routes/about/+page.svelte, each linking to the other with <a href={resolve('/')}> and <a href={resolve('/about')}>.
3. Run npm run dev, open the app, and click between Home and About.
4. Observe the browser console showing Empty string passed to getElementById() on navigation.

Logs

System Info

System:
    OS: macOS 15.6
    CPU: (8) arm64 Apple M2
    Memory: 127.45 MB / 8.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.13.1 - /opt/homebrew/bin/node
    Yarn: 1.22.22 - /opt/homebrew/bin/yarn
    npm: 11.6.3 - /opt/homebrew/bin/npm
    pnpm: 10.23.0 - /opt/homebrew/bin/pnpm
  Browsers:
    Firefox: 145.0
    Safari: 18.6
  npmPackages:
    @sveltejs/adapter-static: ~3.0 => 3.0.10 
    @sveltejs/kit: ~2.48 => 2.48.6 
    @sveltejs/vite-plugin-svelte: ~6.2 => 6.2.1 
    svelte: ~5.43 => 5.43.13 
    vite: ~7.2 => 7.2.4

Severity

annoyance

Additional Information

No response