Bug report

What is the current behavior?

Webpack 5 persistent cache + EnvironmentPlugin: environment variables changing doesn’t affect cache.

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

• make webpack config with persistent cache and EnvironmentPlugin
• build code, for example, with env variable TEST_VAR=1, output code will contain value 1
• next build with TEST_VAR=2, output code will still contain value 1

What is the expected behavior?

Environment variable change will affect output code.

Other relevant information: webpack version: 5 Node.js version: 12 Operating System: macOS