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[vite 3.0.7] Vue is not correctly imported in production

See original GitHub issue

Describe the bug

I import vue and a 3rd package portal-vue. It works fine in dev, but raises the following error if I preview the bundle built:

Vue.extend is not a function

This bug looks very similar to an issue vitejs/vite-plugin-vue#34 I reported previously but occurs only since v3.0.6.

✔️Vite v3.0.5 dev ✔️Vite v3.0.5 production ✔️Vite v3.0.6 v3.0.7 dev ❌Vite v3.0.6 v3.0.7 production

Reproduction

https://stackblitz.com/edit/vitejs-vite-e9wniz

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (4) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.14.2 - /usr/local/bin/node
    Yarn: 1.22.10 - /bin/yarn
    npm: 7.17.0 - /bin/npm
  npmPackages:
    vite: ^3.0.7 => 3.0.7

Used Package Manager

pnpm

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 vuejs/core 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.