after webpack4 multi-entry application uses splitChunks split code, HtmlWebpackPlugin cannot inject vendor.bundle and runtime.bundle
entry:

entry: {
    app: path.join(__dirname, "../src/app.js"),
    main: path.join(__dirname, "../src/main.js")
  },

HtmlWebpackPlugin configuration

new HtmlWebpackPlugin({
      chunks: ["main"],
      filename: "main.html",
      template: path.join(__dirname, "../index.html"),
      inject: true,
      minify: {
        removeComments: true
      }
    }),
    new HtmlWebpackPlugin({
      title: "app",
      chunks: ["app"],
      filename: "app.html",
      template: path.join(__dirname, "../app.html"),
      inject: true,
      minify: {
        removeComments: true
      }
    })

optimization configuration

optimization: {
    splitChunks: {
      chunks: "all"
    },
    runtimeChunk: {}
  }

after packing:

main.html main.bundlevendors~main.bundle.jsruntime~main.bundle.js

Why?