CopyWebpackPlugin not copying files correctly when running dev server

[thomas-kuhlmann]

Version

4.5.12

Environment info

webpack@4.46.0
copy-webpack-plugin@6.4.1

Steps to reproduce

Create a monorepo with yarn workspaces, a vue app and another package that contains translations:

.
└── packages/
    ├── applications/
    │   ├── app1/
    │   │   ├── public
    │   │   └── dist
    │   ├── app2
    │   └── ...
    └── common/
        ├── translations/
        │   └── locales/
        │       ├── en-GB/
        │       │   └── common.json
        │       └── de-DE
        ├── ui
        └── ...

Install the copywebpackplugin and configure your vue.config.js to copy locale files from the @namespace/translations module to the /public folder of the vue app.

module.exports = {
      devServer: {
        writeToDisk: true,
      },
      configureWebpack: {
        plugins: [
          new CopyPlugin({
            patterns: [
              {
                from: `${path.dirname(
                  require.resolve(`@namespace/translations/package.json`)
                )}/locales`,
                to: "./public/locales",
                toType: "dir",
              },
            ],
          }),
        ],
      },

What is expected?

That all files from the /locale directory of the translations node_module in the yarn workspace are copied to the /public folder of the vue app, both when you run yarn serve and yarn build. When running yarn serve, the files should be kept in sync and any changes in the source package should be immediately copied to the destination.

What is actually happening?

running yarn serve with the current config results in a loop. The correct files are copied to the /public folder, but at the same time, it creates the /dist folder and floods it with ...hot-update.json files.

if I run yarn build for the first time, the locale files get copied to the /public folder, but not to the /dist folder (so it seems it copies the files at the end of the process, so the latest files aren't included in the /dist folder - it first builds, and then copies)