Why is webpack-dev-server not refreshing the page?

Question

npm

When run with the npm start command, the browser is launched, but when styles and scripts are changed, the page is not refreshed.

webpack.config.js:

const path = require('path')
const HTMLWebpackPlugin = require('html-webpack-plugin')
const {CleanWebpackPlugin} = require('clean-webpack-plugin')
const MiniCssExtractPlugin = require("mini-css-extract-plugin")

// const devMode = process.env.NODE_ENV !== 'production';

module.exports = {
    devServer: {
        port: 9000,
    },
    context: path.resolve(__dirname, 'src'),
    mode: "development",
    entry: {
        main: './index.js',
        analytics: './analytics.js'
    },
    output: {
        filename: "./scripts/[name].[contenthash].js",
        path: path.resolve(__dirname, 'dist')
    },
    plugins: [
        new HTMLWebpackPlugin({
            template: "./index.html",
            inject: 'body'
        }),
        new CleanWebpackPlugin(),
        new MiniCssExtractPlugin({
            filename: "./styles/[name].[contenthash].css",
        })
    ],
    module: {
        rules: [
            {
                test: /\.css$/i,
                use: [MiniCssExtractPlugin.loader, "css-loader"],
            },
            {
                test: /\.s[ac]ss$/i,
                use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"],
            },
        ]
    }
}

package.json:

{
  "name": "localhost",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "webpack --mode development",
    "build": "webpack --mode production",
    "watch": "webpack --mode development --watch",
    "start": "webpack-dev-server --open"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "clean-webpack-plugin": "^4.0.0",
    "css-loader": "^6.7.1",
    "html-webpack-plugin": "^5.5.0",
    "mini-css-extract-plugin": "^2.6.0",
    "node-sass": "^7.0.1",
    "sass-loader": "^12.6.0",
    "style-loader": "^3.3.1",
    "webpack": "^5.72.0",
    "webpack-cli": "^4.9.2",
    "webpack-dev-server": "^4.8.1"
  }
}