In SSR consecutive `query.batch` is called on the client

Describe the bug

{#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}

When the page is accessed, non-first query.batch calls inside the each loop are re-fetched from the client.

In this case, they are getTeacher and getLiveLessonStudentCenter.

The results are all baked in the server rendered HTML:

{
  const h = (window.__svelte ??= {}).h ??= new Map();

  for (const [k, v] of [
    ["q5s0im/getLiveLessons/","[[1,8,14,20],{\"id\":2,\"classId\":3,\"teacherId\":4,\"startTime\":5,\"endTime\":6,\"cancel\":7},\"l1\",\"c1\",\"t1\",[\"Date\",\"2026-05-12T09:59:31.010Z\"],[\"Date\",\"2026-05-12T10:59:31.010Z\"],false,{\"id\":9,\"classId\":10,\"teacherId\":11,\"startTime\":12,\"endTime\":13,\"cancel\":7},\"l2\",\"c2\",\"t2\",[\"Date\",\"2026-05-12T11:29:31.010Z\"],[\"Date\",\"2026-05-12T12:29:31.010Z\"],{\"id\":15,\"classId\":16,\"teacherId\":4,\"startTime\":17,\"endTime\":18,\"cancel\":19},\"l3\",\"c3\",[\"Date\",\"2026-05-12T12:59:31.010Z\"],[\"Date\",\"2026-05-12T13:59:31.010Z\"],true,{\"id\":21,\"classId\":3,\"teacherId\":22,\"startTime\":23,\"endTime\":24,\"cancel\":7},\"l4\",\"t3\",[\"Date\",\"2026-05-12T14:59:31.010Z\"],[\"Date\",\"2026-05-12T15:59:31.010Z\"]]"],
    ["q5s0im/getLiveLessonClass/WyJjMSJd","[{\"classId\":1,\"className\":2,\"subject\":3},\"c1\",\"수학 기초반\",\"수학\"]"],
    ["q5s0im/getLiveLessonClass/WyJjMiJd","[{\"classId\":1,\"className\":2,\"subject\":3},\"c2\",\"영어 심화반\",\"영어\"]"],
    ["q5s0im/getLiveLessonClass/WyJjMyJd","[{\"classId\":1,\"className\":2,\"subject\":3},\"c3\",\"과학 탐구반\",\"과학\"]"],
    ["q5s0im/getTeacher/WyJ0MSJd","[{\"teacherId\":1,\"name\":2},\"t1\",\"김민준\"]"],
    ["q5s0im/getTeacher/WyJ0MyJd","[{\"teacherId\":1,\"name\":2},\"t3\",\"박지호\"]"],
    ["q5s0im/getTeacher/WyJ0MiJd","[{\"teacherId\":1,\"name\":2},\"t2\",\"이서연\"]"],
    ["q5s0im/getLiveLessonStudentCenter/WyJjMSJd","[{\"classId\":1,\"studentCount\":2,\"centerName\":3},\"c1\",12,\"강남센터\"]"],
    ["q5s0im/getLiveLessonStudentCenter/WyJjMyJd","[{\"classId\":1,\"studentCount\":2,\"centerName\":3},\"c3\",15,\"송파센터\"]"],
    ["q5s0im/getLiveLessonStudentCenter/WyJjMiJd","[{\"classId\":1,\"studentCount\":2,\"centerName\":3},\"c2\",8,\"서초센터\"]"]
  ]) {
    h.set(k, v);
  }
}

cc @Yeonho-Lee

Reproduction

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

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

annoyance

Additional Information

No response

Start by reproducing the issue with the linked svelte-kit-15826 template, then compare the server-rendered query.batch data with browser network requests during hydration. The fix is complete when consecutive query.batch calls already represented in the SSR HTML are not redundantly fetched by the client.