环境信息：
1.系统：MacOS Mojave 10.14.5；
2.浏览器：Google Chrome 81.0.4044.122（正式版本，64位，目前最新）；
3.NodeJS：v12.16.2；
4.NPM：v6.14.4；
5.Yarn 镜像源地址：https://registry.npmjs.org/；
6.@vue/cli：v4.3.1；
7.Yarn：v1.5.1；

重现步骤：
1.vue create vue3-beta；
（1）Please pick a preset -> Manually select features
（2）Check the features needed for your project -> Babel，Router，Vuex，Linter / Formatter
（3）Use history mode for router? -> Y
（4）Pick a linter / formatter config -> ESLint with error prevention only
（5）Pick additional lint features -> Lint on save
（6）Where do you prefer placing config for Babel, ESLint, etc.? -> In dedicated config files
（7）Save this as a preset for future projects? -> N
2.此时 yarn serve 后，更改 /src/views/Home.vue 后，HMR 有效；
3.vue add vue-next；
4.此后再进行 yarn serve，更改 /src/views/Home.vue 后，HMR 失效；

现象：
1.HMR 失效，更改 .vue 后浏览器不会自动刷新，手动刷新后试图变更；
2.浏览器控制台，保持打印：[HMR] Waiting for update signal from WDS...，更改 .vue 后打印无变化；

附 package.json 内容：

{
  "name": "vue3-beta",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
    "core-js": "^3.6.4",
    "vue": "^3.0.0-beta.1",
    "vue-router": "^4.0.0-alpha.5",
    "vuex": "^4.0.0-alpha.1"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "~4.3.0",
    "@vue/cli-plugin-eslint": "~4.3.0",
    "@vue/cli-plugin-router": "~4.3.0",
    "@vue/cli-plugin-vuex": "~4.3.0",
    "@vue/cli-service": "~4.3.0",
    "@vue/compiler-sfc": "^3.0.0-beta.1",
    "babel-eslint": "^10.1.0",
    "eslint": "^6.7.2",
    "eslint-plugin-vue": "^7.0.0-alpha.0",
    "vue-cli-plugin-vue-next": "~0.1.2"
  }
}

烦请尽快解决，有什么需要配合定位的我这边尽力配合，谢谢！