Import-MamlHelp generates duplicate syntax parameters

[teramako]

Prerequisites

• [x] Write a descriptive title.
• [x] Make sure you are able to repro it on the latest version
• [x] Search the existing issues.

Steps to reproduce

$cmdHelps = Import-MamlHelp -Path ./test/Pester/assets/Microsoft.PowerShell.Commands.Utility.dll-Help.xml
$cmdHelps[0].Syntax[0].SyntaxParameters | ft ParameterName,ParameterType

And the syntax of the resulting conversion to Markdown also duplicates each parameter.

Export-MarkdownCommandHelp -CommandHelp $cmdHelps[0] -OutputFolder ...

Expected behavior

ParameterName ParameterType
------------- -------------
MemberType    System.Management.Automation.PSMemberTypes
Name          System.String
Value         System.Object
SecondValue   System.Object
Force         System.Management.Automation.SwitchParameter
InputObject   System.Management.Automation.PSObject
PassThru      System.Management.Automation.SwitchParameter
TypeName      System.String

Actual behavior

ParameterName ParameterType
------------- -------------
MemberType    System.Management.Automation.PSMemberTypes
MemberType    System.Management.Automation.PSMemberTypes
Name          System.String
Name          System.String
Value         System.Object
Value         System.Object
SecondValue   System.Object
SecondValue   System.Object
Force         System.Management.Automation.SwitchParameter
Force         System.Management.Automation.SwitchParameter
InputObject   System.Management.Automation.PSObject
InputObject   System.Management.Automation.PSObject
PassThru      System.Management.Automation.SwitchParameter
PassThru      System.Management.Automation.SwitchParameter
TypeName      System.String
TypeName      System.String

Error details

Environment data

PS> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.5.2
PSEdition                      Core
GitCommitId                    7.5.2
OS                             Ubuntu 24.04.3 LTS
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Version

1.0.1

Visuals

No response