BUG: <svelte:boundary> not working when error occurs inside #if block (only in production build)

[zeroberry]

Describe the bug

When an error occurs inside #if block within an <svelte:boundary>, there is a bug where the remaining elements are not removed and remain visible.
This issue doesn't occur in the development environment but only happens in the production build. (NODE_ENV=production)

<svelte:boundary>
  <div>This should be removed</div>
  {#if true}
    <ErrorComponent />  <!-- This throws an error -->
  {/if}

  {#snippet failed()}
    <div>error boundary</div>
  {/snippet}
</svelte:boundary>

Reproduction

https://stackblitz.com/edit/vitejs-vite-zvok4jqx?file=src%2FApp.svelte
You can reproduce this issue by running:
NODE_ENV=production npm run dev or npm run build && npm run preview

Logs

System Info

System:
  OS: macOS 15.1
  CPU: (14) arm64 Apple M3 Max
  Memory: 2.69 GB / 36.00 GB
  Shell: 5.9 - /bin/zsh
Binaries:
  Node: 22.13.0 - ~/.local/state/fnm_multishells/49337_1743582171802/bin/node
  Yarn: 1.22.22 - ~/.local/state/fnm_multishells/49337_1743582171802/bin/yarn
  npm: 10.9.2 - ~/.local/state/fnm_multishells/49337_1743582171802/bin/npm
  pnpm: 9.15.0 - ~/.local/state/fnm_multishells/49337_1743582171802/bin/pnpm
Browsers:
  Chrome: 134.0.6998.166
  Safari: 18.1
npmPackages:
  svelte: ^5.20.2 => 5.25.6

Severity

annoyance

[minkky]

Could this issue be related to this line?