[BUG] No results returned for the `fileSearch` tool when querying a network drive, works fine when ommited

[EDM115]

copilot-chat chat-agent bug Issue identified by VS Code Team member as probable bug

• Copilot Chat Extension Version: directly included in VS ode
• VS Code Version: 1.122.0-insider
• OS Version: Windows 11
• Feature (e.g. agent/edit/ask mode): Agent mode
• Selected model (e.g. GPT 4.1, Claude 3.7 Sonnet): GPT-5.5 Medium

Steps to Reproduce:

1. Open a folder on a network drive
2. Query Copilot in a way that would need it to search for files itself
3. See the fileSearch tool return 0 results for /192.168.1.50/path/to/folder/** (for example)
4. See it actually return results when querying **/folder/**