no tab complete for predefined cmdlet param values

Prerequisites

• I have written a descriptive issue title.
• I have searched all issues to ensure it has not already been reported.
• I have read the troubleshooting guide.
• I am sure this issue is with the extension itself and does not reproduce in a standalone PowerShell instance.
• I have verified that I am using the latest version of Visual Studio Code and the PowerShell extension.

Summary

no tab complete for predefined cmdlet param values
Compare to the ISE or a PS prompt, where it works correctly.

The VSC peoples said this is an issue with the PS extension.

PowerShell Version

Name                           Value
----                           -----
PSVersion                      5.1.19041.1320
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.19041.1320
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Visual Studio Code Version

the instructional code doesn't work, so this is from VSC's About dlg:
Version: 1.63.2
Commit: 899d46d82c4c95423fb7e10e68eba52050e30ba3
Date: 2021-12-15T09:40:02.816Z
Electron: 13.5.2
Chromium: 91.0.4472.164
Node.js: 14.16.0
V8: 9.1.269.39-electron.0
OS: Windows_NT x64 10.0.19044

Extension Version

the instructional code doesn't work, so this is from the extension details page:
v2021.12.0
Last updated
12/22/2021, 15:56:27
Identifier
ms-vscode.powershell

Steps to Reproduce

1. start a new PowerShell file
2. type a cmdlet (e.g. 'get-item'), space, -err, tab <<-- this gives you "-ErrorAction"
3. space
4. tab, the predefined list of values (e.g., "Continue", "Ignore") does not appear
   THUS, you have to guess what the possible values are.
   Compare to the ISE or a PS prompt, where it works correctly.

Visuals

No response

Logs

No response

Start by reproducing the reported completion behavior in a new PowerShell file with get-item -err, then press Tab after entering the parameter value position. Trace the extension's completion handling from that reproduction; done means predefined values such as Continue and Ignore appear, matching the PowerShell prompt or ISE.