Bug report

What is the current behavior?
all the methods defined in commonjs module will be include in dist file

If the current behavior is a bug, please provide the steps to reproduce.

This is the repo for reproduce。

What is the expected behavior?
only include used methods in my commonjs module

Other relevant information:
webpack version:

• "webpack": "^5.51.1",
• "webpack-cli": "^4.8.0"
  Node.js version: v12.14.0
  Operating System: Win 10
  Additional tools: null