page.url doesn't update properly with async svelte.

Describe the bug

When enabling async Svelte, and you're awaiting promises inside your pages, the navigation will break if you click on multiple links really fast. Faster than your promises resolve.
Svelte will basically just break, and also the page.url will be wrong.
I also think $effect.pending() or navigation.to will get stuck forever.

Reproduction

Just click on multiple links really fast.
https://stackblitz.com/edit/sveltejs-kit-template-default-d1euvfpx?file=src%2Froutes%2F%2Blayout.svelte

Logs

System Info

System:
    OS: macOS 26.3
    CPU: (10) arm64 Apple M1 Pro
    Memory: 83.86 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.12.0 - /Users/.../.nvm/versions/node/v22.12.0/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 10.9.0 - /Users/.../.nvm/versions/node/v22.12.0/bin/npm
    pnpm: 10.5.2 - /opt/homebrew/bin/pnpm
    bun: 1.3.9 - /opt/homebrew/bin/bun
    Deno: 2.2.4 - /opt/homebrew/bin/deno
  Browsers:
    Chrome: 145.0.7632.117
    Firefox: 147.0.4
    Safari: 26.3
  npmPackages:
    @sveltejs/adapter-auto: ^7.0.1 => 7.0.1
    @sveltejs/enhanced-img: 0.10.2 => 0.10.2
    @sveltejs/kit: ^2.53.4 => 2.53.4
    @sveltejs/vite-plugin-svelte: 6.2.4 => 6.2.4
    svelte: 5.53.6 => 5.53.6
    vite: ^7.3.1 => 7.3.1

Severity

blocking an upgrade

Additional Information

No response

Start with the linked StackBlitz reproduction and reproduce rapid navigation between pages that await promises with async Svelte enabled. Trace the navigation state, page.url, $effect.pending(), and navigation.to while links are clicked quickly; done means navigation completes without breaking and these values remain correct.