Markdig.Signed - Assembly with same name is already loaded - when importing Microsoft.Powershell.PlatyPS

[ahpooch]

Problem

When creating task involving Microsoft.Powershell.PlatyPS, assembly Markdig.Signed could not be loaded.

Steps to reproduce

Create UpdateHelpFiles Task

Task("ImportPlatyPS")
    .Description("Test importing Microsoft.Powershell.PlatyPS")
    .Does(() =>
{
    StartPowershellScript(
        @"Write-Host ""Test Successfull""", new PowershellSettings()
            .WithModule("Microsoft.Powershell.PlatyPS")
            .OutputToAppConsole(true)
    );
});

Then run task

.\build.ps1 --Target=ImportPlatyPS

Expected behaviour

Output "Test Successfull"

Actual behaviour

An error occurred when executing task 'ImportPlatyPS'.
Error: Failed to Execute Powershell Script: System.Management.Automation.CmdletInvocationException: Could not load file or assembly 'Markdig.Signed, Version=0.33.0.0, Culture=neutral, PublicKeyToken=870da25a133885f8'. Assembly with same name is already loaded
 ---> System.IO.FileLoadException: Could not load file or assembly 'Markdig.Signed, Version=0.33.0.0, Culture=neutral, PublicKeyToken=870da25a133885f8'. Assembly with same name is already loaded
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadBinaryModule(PSModuleInfo parentModule, String moduleName, String fileName, Assembly assemblyToLoad, String moduleBase, SessionState ss, ImportModuleOptions options, ManifestProcessingFlags manifestProcessingFlags, String prefix, Boolean& found, String shortModuleName, Boolean disableFormatUpdates)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadBinaryModule(PSModuleInfo parentModule, String moduleName, String fileName, Assembly assemblyToLoad, String moduleBase, SessionState ss, ImportModuleOptions options, ManifestProcessingFlags manifestProcessingFlags, String prefix, Boolean& found)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadModule(PSModuleInfo parentModule, String fileName, String moduleBase, String prefix, SessionState ss, Object privateData, ImportModuleOptions& options, ManifestProcessingFlags manifestProcessingFlags, Boolean& found, Boolean& moduleFileFound)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadModuleNamedInManifest(PSModuleInfo parentModule, ModuleSpecification moduleSpecification, String moduleBase, Boolean searchModulePath, String prefix, SessionState ss, ImportModuleOptions options, ManifestProcessingFlags manifestProcessingFlags, Object privateData, Boolean& found, String shortModuleName, Nullable`1 manifestLanguageMode)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadModuleManifest(String moduleManifestPath, ExternalScriptInfo manifestScriptInfo, Hashtable data, Hashtable localizedData, ManifestProcessingFlags manifestProcessingFlags, Version minimumVersion, Version maximumVersion, Version requiredVersion, Nullable`1 requiredModuleGuid, ImportModuleOptions& options, Boolean& containedErrors)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadModuleManifest(ExternalScriptInfo scriptInfo, ManifestProcessingFlags manifestProcessingFlags, Version 
minimumVersion, Version maximumVersion, Version requiredVersion, Nullable`1 requiredModuleGuid, ImportModuleOptions& options)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadModule(PSModuleInfo parentModule, String fileName, String moduleBase, String prefix, SessionState ss, Object privateData, ImportModuleOptions& options, ManifestProcessingFlags manifestProcessingFlags, Boolean& found, Boolean& moduleFileFound)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadUsingExtensions(PSModuleInfo parentModule, String moduleName, String fileBaseName, String extension, String moduleBase, String prefix, SessionState ss, ImportModuleOptions options, ManifestProcessingFlags manifestProcessingFlags, Boolean& found, Boolean& moduleFileFound)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadUsingExtensions(PSModuleInfo parentModule, String moduleName, String fileBaseName, String extension, String moduleBase, String prefix, SessionState ss, ImportModuleOptions options, ManifestProcessingFlags manifestProcessingFlags, Boolean& found)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadUsingMultiVersionModuleBase(String moduleBase, ManifestProcessingFlags manifestProcessingFlags, ImportModuleOptions importModuleOptions, Boolean& found)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadUsingModulePath(PSModuleInfo parentModule, IEnumerable`1 modulePath, String name, SessionState ss, ImportModuleOptions options, ManifestProcessingFlags manifestProcessingFlags, PSModuleInfo& module)
   at Microsoft.PowerShell.Commands.ModuleCmdletBase.LoadUsingModulePath(IEnumerable`1 modulePath, String name, SessionState ss, ImportModuleOptions options, ManifestProcessingFlags manifestProcessingFlags, PSModuleInfo& module)
   at Microsoft.PowerShell.Commands.ImportModuleCommand.ImportModule_LocallyViaName(ImportModuleOptions importModuleOptions, String name)
   at Microsoft.PowerShell.Commands.ImportModuleCommand.ImportModule_LocallyViaName_WithTelemetry(ImportModuleOptions importModuleOptions, String name)
   at Microsoft.PowerShell.Commands.ImportModuleCommand.ProcessRecord()
   at System.Management.Automation.Cmdlet.DoProcessRecord()
   at System.Management.Automation.CommandProcessor.ProcessRecord()
   --- End of inner exception stack trace ---
   at System.Management.Automation.ExceptionHandlingOps.CheckActionPreference(FunctionContext funcContext, Exception exception)
   at System.Management.Automation.Interpreter.ActionCallInstruction`2.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0)
   at System.Management.Automation.DlrScriptCommandProcessor.RunClause(Action`1 clause, Object dollarUnderbar, Object inputToProcess)
--- End of stack trace from previous location ---
   at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input)
   at System.Management.Automation.Runspaces.LocalPipeline.InvokeHelper()
   at System.Management.Automation.Runspaces.LocalPipeline.InvokeThreadProc() (Could not load file or assembly 'Markdig.Signed, Version=0.33.0.0, Culture=neutral, PublicKeyToken=870da25a133885f8'. Assembly with same name is already loaded)
        Could not load file or assembly 'Markdig.Signed, Version=0.33.0.0, Culture=neutral, PublicKeyToken=870da25a133885f8'. Assembly with same name is already loaded

As far as I understand, the problem is that binary modules are loaded into the same default Assembly Load Context (ALC).
A potential solution might be to isolate dependencies to prevent conflicts with other modules.

I should note that I was only able to use Cake.Powershell successfully by using the directive:
#addin nuget:?package=Cake.Powershell&version=4.0.0&loaddependencies=true
Otherwise, I encountered the problem described in this issue.