Async: interactivity breaks when you hover a link of another page (prefetch)

[elisiopinheiro]

Describe the bug

There is a weird bug that happens when using compilerOptions.experimental.async enabled.
If we have a server load function returning a promise, and in the page we are using #await / :then , if we hover a link that triggers prefetch, the interactive elements of the current page stop working.

Reproduction

Here is a reproduction example, with instructions in it:
https://www.sveltelab.dev/m524ivv8qk75b9v

Logs

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 20.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    svelte: ^5 => 5.45.2

Severity

annoyance

[elisiopinheiro]

Might be related to #17197