- Operating System: Win10 - Node Version: 12.16.1 - NPM Version: 6.13.4 - webpack Version: 4.44.2 - eslint-webpack-plugin Version: 2.1.0 ### Expected Behavior Build should be failed, webpack-dev-server job should exit or complete ### Actual Behavior The build is failed, but webpack-dev-server job hangs and does not finish  ### Code webpack.common.config.js https://gist.github.com/limejoe/04e87d012f0c27e1983a3a6da0c6be64 webpack.dev_ui_only.config.js https://gist.github.com/limejoe/74cbb88a8e72d0852b799fcecb14f6a5 ### How Do We Reproduce? run webpack-dev-server --open --config webpack.dev_ui_only.config.js