SSR `query.batch` result disappears on hydration

Describe the bug

According to https://github.com/sveltejs/kit/issues/15826 the 1st query.remote is not recalled on the client.

The result is in the HTML and reused, and the server rendered HTML is correct.

{#each await getLiveLessons() as lesson (lesson.id)}
  <!-- all `query.batch` remote functions: -->
  {@const cls = await getLiveLessonClass(lesson.classId)}
  {@const teacher = await getTeacher(lesson.teacherId)}
  {@const students = await getLiveLessonStudentCenter(lesson.classId)}
{/each}

However cls becomes undefined in the client during hydration.

After refreshing (F5), the cls?.subject is shown and then turned into blank.

Reproduction

When getTeacher is the 1st @const block, the 4th column disappear.

When getLiveLessonClass is the 1st @const block, 2nd and 3rd columns disappear.

https://github.com/user-attachments/assets/8b5c1005-1beb-460b-a3ba-dc1d2e8a24b2

https://github.com/hyunbinseo/svelte-kit-templates/tree/svelte-kit-15826

Logs

System Info

System:
  OS: Windows 11 10.0.26200
  CPU: (8) x64 Intel(R) Core(TM) Ultra 7 258V
  Memory: 4.78 GB / 31.48 GB
Binaries:
  Node: 24.15.0 - C:\Users\hyunb\AppData\Local\fnm_multishells\19996_1778584201985\node.EXE
  npm: 11.12.1 - C:\Users\hyunb\AppData\Local\fnm_multishells\19996_1778584201985\npm.CMD
  pnpm: 10.33.2 - C:\Users\hyunb\AppData\Local\fnm_multishells\19996_1778584201985\pnpm.CMD
  Deno: 2.4.0 - C:\Users\hyunb\.deno\bin\deno.EXE
Browsers:
  Chrome: 148.0.7778.96
  Edge: Chromium (140.0.3485.54)
  Firefox: 150.0.2 - C:\Program Files\Mozilla Firefox\firefox.exe
npmPackages:
  @sveltejs/adapter-auto: ^7.0.1 => 7.0.1
  @sveltejs/kit: ^2.59.1 => 2.59.1
  @sveltejs/vite-plugin-svelte: ^7.1.2 => 7.1.2
  svelte: ^5.55.5 => 5.55.5
  vite: ^8.0.12 => 8.0.12

Severity

blocking all usage of SvelteKit

Additional Information

No response

Start by running the linked svelte-kit-15826 reproduction and inspect the SSR and hydration behavior of the query.batch remote functions, especially the first @const block inside the each block. Done means cls, teacher, and students remain available after hydration and after a refresh, regardless of their ordering.