Assets refreshing not working with html-webpack-plugin v4

Hi, thanks for the great work of this plugin.

It seems not working well with html-webpack-plugin v4. The compilation missing to refresh assets after assets updated.

I created a repo which can reproduce the bug. Hope it will help.

Reproducing steps:

1. Run npm start
2. Update assets/dll.js
3. Watch the webpack log, it does re-compile, but no assets updated.
4. Open the dist/dll.js, it's stale. (the devServer.writeToDisk option is just for convenience of debugging)

More info:

When webpack first started, the assets do be added:

Version: webpack 4.42.1
Time: 334ms
Built at: 04/10/2020 10:18:50 PM
          Asset       Size  Chunks             Chunk Names
         dll.js   19 bytes          [emitted]  
     index.html  263 bytes          [emitted]  
index_bundle.js    360 KiB    main  [emitted]  main
Entrypoint main = index_bundle.js

But when assets file updated, the re-compilation missed the assets.

ℹ ｢wdm｣: Compiling...
ℹ ｢wdm｣: Hash: a7a08df7cdac9b2219d8
Version: webpack 4.42.1
Time: 10ms
Built at: 04/10/2020 10:19:01 PM
 1 asset
Entrypoint main = index_bundle.js
   33 modules
ℹ ｢wdm｣: Compiled successfully.

And when I downgrade the html-webpack-plugin to v3, it works again.

Run the linked reproducing repository with npm start, then update assets/dll.js and compare the webpack logs and dist/dll.js output with html-webpack-plugin v4 and v3. Trace how the plugin handles asset updates during recompilation; done means the refreshed asset is written to dist/dll.js when using v4.