SvelteKit web worker cache issue

How to reproduce

First, run the following commands to build files.

git clone https://github.com/MoonlightOffice/sveltekit-webworker-cache-issue.git

cd sveltekit-webworker-cache-issue

npm i

npm run build

Next, take a look at build/service-worker.js and try to find file names that start with /_app/immutable/. You'll notice that only /app/immutable/workers/ are not included, while other directories such as /app/immutable/chunks and /app/immutable/entry are included.

How I created this project

1. Run npm create svelte@latest to create a blank project with Svelte 5 enabled.

2. Change the adapter to @sveltejs/adapter-static and add export const prerender = true in +layout.ts.

3. Add a sample web worker demo in src/routes directory.

4. Copy-pasted service worker from SvelteKit's docs.