Loading async chunk gets error when using fullhash

[zlk89]

• Operating System: MacOS Catalina
• Node Version: v12.16.1
• NPM Version: 6.13.4
• webpack Version: 5.20.2
• mini-css-extract-plugin Version: 1.3.5

Expected Behavior

Load the website correctly

Actual Behavior

Loading it on browser, gets this error:

3ad75b68b6c11f8210e7.js:384 Uncaught (in promise) TypeError: __webpack_require__.h is not a function
    at Function.__webpack_require__.miniCssF (3ad75b68b6c11f8210e7.js:384)
    at 3ad75b68b6c11f8210e7.js:536
    at new Promise (<anonymous>)
    at loadStylesheet (3ad75b68b6c11f8210e7.js:535)
    at Object.__webpack_require__.f.miniCss (3ad75b68b6c11f8210e7.js:551)

Code

// webpack.config.js, see the reprod repo for more details
new MiniCssExtractPlugin({
    filename: '[fullhash].css',
    chunkFilename: '[fullhash].chunk.css',
})

// In index.js, load scss in a separate chunk
import('./style.css');

How Do We Reproduce?

1. Go to this repro and branch /~https://github.com/zlk89/webpack-reprods/tree/mini-css-breaks-fullhash
2. yarn install
3. yarn start
4. Open http://localhost:8080/ you will see the error on console

This bug only happens when you use fullhash in the css name, and async loading the css file