Version

5.0.3

Environment info

win 10
node v16.14.2
yarn v1.22.18

Steps to reproduce

At first the repo can run normally through yarn serve

then, I use vue upgrade --next to upgrade vue-cli@4.5.3 to vue-cli@5.0.3
then, I use yarn serve again but Error

I added console.log in @vue/cli-shared-utils/lib/env.js of node_modules, and found that the internal error was Error: Command failed: yarn --version.
But! I can use yarn -v to check my yarn version on my cmd.

And the difference is that there is no throw error in vue-cli@4.5.3, while vue-cli@5.0.3 exits directly. Why is this happening? It is obvious that the code of yarn is the same.

How can the repo run normally through yarn serve?

dependence
"vue": "^2.6.11",
"@vue/cli-plugin-babel": "~4.5.0",
"@vue/cli-plugin-eslint": "~4.5.0",
"@vue/cli-plugin-router": "~4.5.0",
"@vue/cli-plugin-vuex": "~4.5.0",
"@vue/cli-service": "~4.5.0",

What is expected?

I hope to use yarn serve to run repo.

What is actually happening?

ERROR Error: The project seems to require yarn but it's not installed.

this is vue-cli@5.0.3

this is vue-cli@4.5.x