Stale form values unless query is listed in .updates() #15787

Describe the bug

Suppose you have a form that uses form.fields.as(type, defaultValue) where defaultValue is a property on an object resulting from a query, the form does NOT refresh the rendered values unless the query is explicitly listed in a .updates() call on the client. This applies to both query.refresh and query.set on the server.

Interestingly, not calling .updates on the client and only calling query.refresh on the server does indeed refresh the query, and everything in the UI that depends on it is updated as well, EXCEPT for the form values.

Reproduction

https://stackblitz.com/edit/forms-not-refreshing?file=README.md

• Start the dev server.
• Click on any of the test posts.
• Edit some fields.
• Click "Update"

Expected: the new values should be submitted and remain rendered in the form.

Actual: the new values are submitted, but the form values revert to the old values.

Logs

System Info

System:
    OS: Windows 11 10.0.26200
    CPU: (28) x64 Intel(R) Core(TM) i7-14700K
    Memory: 35.36 GB / 63.70 GB
  Binaries:
    Node: 24.15.0 - C:\Program Files\nodejs\node.EXE
    npm: 11.7.0 - C:\Users\Abdo\AppData\Roaming\npm\npm.CMD
    bun: 1.3.13 - C:\Users\Abdo\.bun\bin\bun.EXE
    Deno: 2.7.12 - C:\Program Files\deno\deno.EXE
  Browsers:
    Chrome: 147.0.7727.138
    Edge: Chromium (140.0.3485.81)
    Firefox: 150.0 - C:\Program Files\Mozilla Firefox\firefox.exe
    Internet Explorer: 11.0.26100.8115
  npmPackages:
    @sveltejs/adapter-node: 5.5.4 => 5.5.4 
    @sveltejs/kit: 2.59.0 => 2.59.0 
    @sveltejs/vite-plugin-svelte: 7.0.0 => 7.0.0 
    svelte: 5.55.5 => 5.55.5 
    vite: 8.0.10 => 8.0.10

Severity

serious, but I can work around it

Additional Information

No response