vite: Unexpected content if there's `import()` in a js file and import with `?url`

Describe the bug

I import a worker.js’s URL using

import WorkerURL from "@/vendors/worker.js?url"

And vite serves worker URL to browser with added file header if there’s a import() in the worker file

import { injectQuery as __vite__injectQuery } from "/@vite/client";

// origin worker file contents
// ........ 
// ........

and cause error Uncaught SyntaxError: Cannot use import statement outside a module

Reproduction

https://github.com/rwv/vite-import-url-issue

Steps to reproduce

Run npm run dev and npm run build and open the web page.

System Info

System:
    OS: Linux 5.4 Ubuntu 20.04.1 LTS (Focal Fossa)
    CPU: (16) x64 Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz
    Memory: 24.60 GB / 31.40 GB
    Container: Yes
    Shell: 5.8 - /usr/bin/zsh
  Binaries:
    Node: 16.15.1 - ~/.nvm/versions/node/v16.15.1/bin/node
    Yarn: 1.22.19 - ~/.nvm/versions/node/v16.15.1/bin/yarn
    npm: 8.11.0 - ~/.nvm/versions/node/v16.15.1/bin/npm

Used Package Manager

npm

Logs

No response

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