.net intellisense break in workspaces

DudDashboard リポジトリを使用して VS Code ワークスペースで障害を再現し、単一の PowerShell ファイルと、多数のファイルを含むフォルダーを比較します。まず、添付されたログと、IntelliSense の繰り返しリクエスト周辺における拡張機能の動作を確認します。PowerShell セッションの読み込み後、および IntelliSense を再度開いた後も .NET 名前空間の候補が利用可能なままであれば完了です。

Issue Type: Bug

This happens whenever I have anything loaded in Powershell with more than a few files.

Whenever I start VsCode and / or kill my session, there is a moment where the .net intelisense work normally.

However, a mere second after, anything from the .net space disappear and I only get the Powershell intellisense instead.

If using VsCode with a single file, it works fine.
As soon as I open a folder containing dozens of Powershell files (within or without a workspace), it work briefly as the session load, then break.

To reproduce:

1. Clone https://github.com/itfranck/DudDashboard
2. Start VSCode
3. Open a ps1 file
4. Type [System. then press space

For a few seconds, Collections / Threading / Net and other .Net namespace will be available.
If you repeat the operation a few time, the .Net namespaces stop being suggested and only Powershell suggestions occurs.

This happened for a few months with both Powershell and Powershell Preview extension and with both VsCode and VsCode insiders.

Here are the logs :
logs.zip
Context :

• I opened vscode
• I loaded my workspace containing my project
• I typed [system. then pressed CTRL + Space to force intellisense then I saw .net elements shown there and pressed Escape to close the intellisense.
• Powershell integrated console message showed in the terminal
• I pressed CTRL + Space again
• Intellisense showed again, but this time, all .net related suggestion had disappeared.

If there's any addtional logs I can include to provide more insight, I will be happy to.

Extension version: 2019.5.0
VS Code version: Code 1.37.1 (f06011ac164ae4dc8e753a3fe7f9549844d15e35, 2019-08-15T16:17:55.855Z)
OS version: Windows_NT x64 10.0.17763