Page scroll position not reset to top on navigation (regression)

Describe the bug

When navigating to a new page, if you are already scrolled partway down the page, the next page load will keep the current scroll position and not scroll back to the top.

I believe this broke with next-193. When I install next-192, this does not happen -- navigating to a new page always scrolls to the top, just like regular browser navigation.

Reproduction

Init the SvelteKit demo project. Add the following paragraph in about.svelte after the last paragraph.

<p>Go <a href="/">home</a></p>

Make the browser window small enough so that the page scrolls and scroll to the bottom of the page. Click the Home link. The Home page loads, but does not scroll to the top (i.e. the nav bar is not visible).

.

Tested in Chrome and Firefox on Windows 10.

Logs

No response

System Info

System:
    OS: Linux 4.19 Ubuntu 20.04.1 LTS (Focal Fossa)
    CPU: (4) x64 Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz
    Memory: 7.79 GB / 12.40 GB
    Container: Yes
    Shell: 5.0.17 - /bin/bash
  Binaries:
    Node: 14.17.0 - ~/.nvm/versions/node/v14.17.0/bin/node
    Yarn: 1.22.5 - /usr/bin/yarn
    npm: 8.1.1 - ~/.nvm/versions/node/v14.17.0/bin/npm
  Browsers:
    Chrome: 89.0.4389.90
  npmPackages:
    @sveltejs/kit: ^1.0.0-next.193 => 1.0.0-next.193
    svelte: ^3.34.0 => 3.44.1

Severity

serious, but I can work around it

Additional Information

No response

Reproduce the issue in the SvelteKit demo using the added link in about.svelte, scrolling before navigating home. Compare behavior between next-192 and next-193, then trace the navigation handling responsible for scroll restoration. Done means navigating to a new page returns the viewport to the top in the reported browsers.