Tracked file are being deleted when running "git clean -xdf" in "yarn workspaces"

When running git clean -xdf in a repo with yarn workspaces, the contents of the workspaces are deleted.

Consider this folder structure:

• workspace1
  • index.js
  • package.json
• workspace2
  • index.js
  • package.json
• .gitignore
• README.md
• package.json
• yarn.lock

After running git clean -xfd the files in bold (tracked source controlled files) are deleted! Even though clean shouldn't have impacted tracked files at all.

I believe yarn workspaces bug. I've opened an issue @yarn: yarnpkg/yarn#7536

How to reproduce

1. Clone the repo.
2. Run yarn in the root folder or in one of the workspaces.
3. Run git clean -xdf

The contents of the workspaces are deleted.