Extension won't be reinstalled after deleting it manually under pxt_modules

[Sheila111]

Describe the bug
Extension won't be reinstalled after deleting it manually under pxt_modules

Steps to reproduce the behavior

1. Navigate to https://arcade.makecode.com/beta#
2. Create a project and switch to JavaScript editor
3. Click "Open in VS Code" under simulator
4. Delete an extension file manually (eg. delete "darts") under pxt_modules
5. Access the MakeCode Asset Explorer by clicking on the MakeCode icon in the Visual Studio Code action bar
6. Click "Install Project Dependencies"
7. Back to check whether this extension is reinstalled under pxt_modules

Actual behavior
Extension won't be reinstalled after deleting it manually under pxt_modules

Expect behavior
Extension will be reinstalled after deleting it manually under pxt_modules

Screenshot

Additional context
1.OS: Windows11
2.arcade version: 1.13.11
3.Microsoft MakeCode version: 8.6.14

[riknoll]

This only repros on projects that are opened via the "open in vscode" button. In other words, just projects that are stored in the virtual file system. Works just fine when you've opened a project in a folder and on desktop.

I'm guessing this is something to do with the virtual file system not properly checking if a file exists or something like that. I'll try and debug it locally!