Describe the bug

With upgrading Vite from 2.4.4 to 2.5.0 (even with beta.0), the Vuex-ORM package stopped working as expected.

The issue is on Vuex-ORM model fields, it loses all fields except $id.

I already know that Vuex-ORM is an external package from Vute/Vite.

Reproduction

Using Vite 2.4.4, it works as expected:
https://codesandbox.io/s/spring-https-vn0nt

Using Vite 2.5.0, you can see that no items from models are shown:
https://codesandbox.io/s/wandering-shadow-emfn2

System Info

System:
    OS: Linux 5.13 Arch Linux
    CPU: (4) x64 Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
    Memory: 6.25 GB / 15.54 GB
    Container: Yes
    Shell: 5.1.8 - /bin/bash
  Binaries:
    Node: 14.16.0 - /usr/local/bin/node
    Yarn: 1.22.11 - /usr/bin/yarn
    npm: 7.20.0 - /usr/local/bin/npm
  Browsers:
    Chromium: 92.0.4515.131
    Firefox: 91.0
  npmPackages:
    @vitejs/plugin-vue: ^1.3.0 => 1.4.0 
    vite: 2.4.4 => 2.4.4

Used Package Manager

yarn

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/vue-next instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.