currentUpdate is undefined reproducible repo

This repo should reproduce the bug reported in webpack/webpack#14873 with the correct environment.

Environment

Note: This environment is my environment where I observed the bug to occur, it isn't to say it's the only or most correct environment to reproduce the bug.

• Windows 10 (latest as of March 27th, 2022)
• Node v15.5.1
• Yarn v1.22.15
• Firefox 98.0.2 (64-bit)
• webpack 5.70.0
• webpack-cli 4.9.2
• webpack-dev-server 4.7.4
• html-webpack-plugin 5.5.0
• lodash 4.17.21

Steps to Reproduce

NOTE: I've observed this isn't always deterministic. If you don't observe the error, stop the server and try again with another yarn start. Error seems to occur more often than not.

1. Clone repo
2. Run yarn start
3. Visit http://localhost:8080/
4. Open web developer console and observe everything is looking OK
5. Edit src/index.js:9 and replace the string 'changeme' with 'changed' and save
6. Observe the error:

Uncaught TypeError: currentUpdate is undefined
    webpackHotUpdatetypescript_playground jsonp chunk loading:44
    <anonymous> index.b3cb07f96b935883211b.hot-update.js:2

NOTE: appending or prepending to the string array does not reproduce the the error. The value of a pre-existing string must be changed.

Other Reproducible Actions

• Add a console.log("foo"); after line 15
• Changing the string in btn.innerHTML on line 12