Extension preventing other extensions loading

The PowerShell Tools for Visual Studio extension appears to be stuck during loading (in the background thread) even when loading VS without a solution.

The Background Tasks icons is constantly animated and when clicked on the popup says "Loading Extensions" "Loading 1/3: PowerShellToolsPackage".

Trying to access Tools|Options|PowerShell Tools during this time crashes Visual Studio

This prevents other extensions (e.g. ReSharper) from loading.

Eventually (several minutes later at least) other extensions load.

Visual Studio Enterprise 2019 Version 16.3.9
PowerShell Tools for Visual Studio (extension) 5.1.1
$PSVersionTable:

Name                           Value
----                           -----
PSVersion                      5.1.16299.1146
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.16299.1146
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

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