Warning missing that usage of this command corrupts manifest file #6767

Hello,
Usage of this command on existing module manifest breaks it's content. I wanted to use this command inside build pipeline to update ModuleVersion attribute, but found at least 2 things that got broken on my manifest module:

• RequiredAssembles attribute: I have something like below in my manifest file, and Update-ModuleManifest removes this attribute completely

RequiredAssemblies = if($PSEdition -eq 'Desktop') {@('lib\net45\someAssembly.dll')} else {$null}

• PrivateData attribute: I have added additional content as hashtable Messages to module's PrivateData as addtional hashtable aside from PSData as shown below, however, Update-ModuleManifest changes the Messages hashtable to Messages = 'System.Collections.Hashtable', which breaks the logic of module

PrivateData = @{
    Messages = @{
        NotInitialized = 'Call Initialize-Module before running other cmdlets.'
    }
    PSData = @{
    # ... standard content
    }

Would be great to update the command so as it does not change the attributes that are not passed from command line, or at least document here what gets changed/reset when command is run, so as users are not surprised after running it.

Thank you,
Jiri

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• ID: 69b6c2e3-f28a-c1a7-7e78-6c0d26001eea
• Version Independent ID: 304167af-fdd4-e3aa-c3e3-79a912844e8a
• Content: Update-ModuleManifest (PowerShellGet) - PowerShell
• Content Source: reference/7.0/PowerShellGet/Update-ModuleManifest.md
• Product: powershell
• Technology: powershell-cmdlets
• GitHub Login: Edwin Young (@edyoung)
• Microsoft Alias: edyoung