Page subscribe only works once after introducing $app/state

[ciscoheat]

Describe the bug

When the $app/state module was added, a regression happened in $app/stores, breaking subscribing to the old page store there. This is the gist:

import { page } from '$app/stores';
page.subscribe((page) => console.log('Page update'));

This only works once if you have a callback on use:enhance and submits a form. After submitting the form multiple times, the subscribe callback isn't triggered.

<form method="POST" use:enhance={() => {
  // If adding use:enhance without this callback, it works
  return async ({ result }) => {
    await applyAction(result);
  };
}}
>
  <button>Submit</button>
</form>

Reproduction

https://github.com/ciscoheat/apply-action-problem

Logs

No response

System Info

System:
    OS: Windows 10 10.0.19045
    CPU: (16) x64 Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz
    Memory: 42.93 GB / 63.93 GB
  Binaries:
    Node: 22.8.0 - C:\Program Files\nodejs\node.EXE       
    Yarn: 1.22.22 - ~\AppData\Local\pnpm\yarn.CMD
    npm: 9.3.1 - C:\Program Files\nodejs\npm.CMD
    pnpm: 9.15.0 - ~\AppData\Local\pnpm\pnpm.CMD
    bun: 1.0.32 - ~\.bun\bin\bun.EXE
  Browsers:
    Edge: Chromium (127.0.2651.74)
    Internet Explorer: 11.0.19041.4355
  npmPackages:
    @sveltejs/adapter-auto: ^3.3.1 => 3.3.1
    @sveltejs/kit: ^2.12.2 => 2.12.2
    @sveltejs/vite-plugin-svelte: ^5.0.3 => 5.0.3
    svelte: ^5.14.4 => 5.14.4
    vite: ^6.0.3 => 6.0.3

Severity

blocking an upgrade

Additional Information

No response