Extensions keep reinstalling every time I load VS Code Desktop

[alessandro-newzoo]

Bug description

There are several extensions that, for some reason, get reinstalled every single time I create/open a Gitpod workspace.
The extensions are not in my VS Code profile. I think they are extensions I have installed (and removed) a long time ago, probably when I was trialling Gitpod (and then decided to ditch it for this exact problem, which I forgot about until I tried it again today).

This is incredibly annoying and it's making it impossible for my team to use Gitpod.

Steps to reproduce

• Open VS Code
• Notice how the extension vscode-twigcs is not installed:
  
• Command pallette → Settings Sync: Sync now
• Create a Gitpod workspace that opens in VS Code Desktop
• Notice how vscode-twigcs is now installed in the new workspace (why??):
  
• Uninstall the extension while the workspace is open
• Reload the VS Code window
• The extension has been reinstalled again 😩

The same thing happens if I close the workspace, uninstall the extension, and create a new workspace.
The same thing happens with many other extensions, and it's driving me insane.
The extensions in question are not in my .gitpod.yml

vscode:
  extensions:
    - ms-azuretools.vscode-docker
    - mrmlnc.vscode-apache
    - ihatetomatoes.gsap3-snippets
    - donjayamanne.jquerysnippets
    - usernamehw.commands
    - vunguyentuan.vscode-css-variables
    - mrmlnc.vscode-less
    - bmewburn.vscode-intelephense-client
    - vunguyentuan.vscode-postcss
    - aswinkumar863.smarty-template-support
    - bradlc.vscode-tailwindcss
    - jdcreations.timber-snippets
    - mrmlnc.vscode-duplicate
    - gruntfuggly.todo-tree
    - xdebug.php-debug

How do I prevent this? Where is Gitpod getting this list of extensions from?

Thank you.

Workspace affected

No response

Expected behavior

No response

Example repository

No response

Anything else?

VS Code 1.93.1 on macOS