Programmatic preflight `validate()`

[hyunbinseo]

Describe the bug

<button
  type="button"
  onclick={() => {
    addId.fields.uuid.set(self.crypto.randomUUID());
    addId.validate();
  }}
>
  Generate
</button>

1. UUID is set then validated. But the validation input is still 123
2. form.fields.input.set() hangs. Have to do multiple clicks for it to work
3. After submission, the validation result says the input is always ''

2025-10-08.083057.mp4

Reproduction

• https://github.com/hyunbinseo/svelte-kit-template/tree/mre-kit-14643
• hyunbinseo/svelte-kit-template@da5d898

Logs

System Info

System:
  OS: Windows 11 10.0.26100
  CPU: (8) x64 Intel(R) Core(TM) Ultra 7 258V
  Memory: 6.02 GB / 31.48 GB
Binaries:
  Node: 24.9.0 - C:\Users\hyunb\AppData\Local\fnm_multishells\35956_1759867104840\node.EXE
  Yarn: 1.22.22 - C:\Users\hyunb\AppData\Local\fnm_multishells\35956_1759867104840\yarn.CMD
  npm: 11.6.0 - C:\Users\hyunb\AppData\Local\fnm_multishells\35956_1759867104840\npm.CMD
  pnpm: 10.18.1 - C:\Users\hyunb\AppData\Local\fnm_multishells\35956_1759867104840\pnpm.CMD
  Deno: 2.4.0 - C:\Users\hyunb\.deno\bin\deno.EXE
Browsers:
  Chrome: 141.0.7390.55
  Edge: Chromium (140.0.3485.54)
  Firefox: 143.0.4 - C:\Program Files\Mozilla Firefox\firefox.exe
npmPackages:
  @sveltejs/adapter-auto: ^6.1.1 => 6.1.1
  @sveltejs/kit: ^2.46.2 => 2.46.2
  @sveltejs/vite-plugin-svelte: ^6.2.1 => 6.2.1
  svelte: ^5.39.10 => 5.39.10
  vite: ^7.1.7 => 7.1.7

Severity

blocking an upgrade

Additional Information

No response