Yarn2工作区未安装依赖项

我正在测试设置 yarn 2 工作区。我想我已经按照我应该的方式完成了它，但是当我yarn install从根目录运行时，它不会安装任何模块，也不会按预期创建依赖项的符号链接。我有以下文件夹结构

root/
  package-a/
  package-b/

每个都包含一个 package.json，每个包文件夹都包含一个 index.js。这是 package.json 文件

根：

{
  "name": "yarn-workspaces-poc",
  "version": "1.0.0",
  "license": "MIT",
  "private": true,
  "workspaces": [
    "package-a/",
    "package-b/"
  ]
}

包-a：

{
  "name": "package-a",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "cross-env": "5.0.5",
    "package-b": "workspace:*"
  }
}

包-b：

{
  "name": "package-b",
  "version": "1.0.0",
  "type": "module",
  "main": "index.js",
  "dependencies": {
    "cross-env": "5.0.5"
  }
}

这是js文件

包-a/index.js

import test from "package-b";
console.log('testing');
console.log(test());

包-b/index.js

export default function b() {
  console.log("From b. You made it!");
}

预期的行为是，当我yarn install从根运行时，将在那里创建 node_modules 文件夹。它应该包含 cross-env 包以及一个符号链接到 package-b 的文件夹。然而，没有任何东西被创建。这是命令的输出：

? YN0000: ? Resolution step
? YN0000: ? Completed
? YN0000: ? Fetch step
? YN0000: ? Completed
? YN0000: ? Link step
? YN0000: ? Completed
? YN0000: Done in 0s 96ms

编辑：

另外，如果我只是运行 package-a 来测试它，结果是：

internal/process/esm_loader.js:74
    internalBinding('errors').triggerUncaughtException(
                              ^

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'package-b' imported from /root/package-a/index.js
Did you mean to import package-b/index.js?
    at packageResolve (internal/modules/esm/resolve.js:655:9)
    at moduleResolve (internal/modules/esm/resolve.js:696:18)
    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:810:11)
    at Loader.resolve (internal/modules/esm/loader.js:86:40)
    at Loader.getModuleJob (internal/modules/esm/loader.js:230:28)
    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:56:40)
    at link (internal/modules/esm/module_job.js:55:36) {
  code: 'ERR_MODULE_NOT_FOUND'
}