Does this issue occur when all extensions are disabled?: No

• VS Code Version: 1.83.0-insider (user setup)
• OS Version: Windows 11

Steps to Reproduce:

1. On a Windows machine share a folder
2. Add a single python file to that folder
3. Clone the sample repo: https://github.com/rchiodo/test-unc-paths
4. Debug the extension
5. Open the file from step 2 using a UNC path. Like \\rchiodo-work\test_unc_paths\test.py

Expected Result:

UNC path is readable in all worker threads.

Actual Result:

UNC path is only readable in the main thread of the extension.

Related:
microsoft/pylance-release#4357