Single entry in ExternalModuleDependencies not respected

[PrzemyslawKlys]

Here's a simple PSD1 file

@{
    AliasesToExport      = 'Connect-POP3', 'Disconnect-POP3', 'Get-POP3Message', 'Save-POP3Message'
    Author               = 'Przemyslaw Klys'
    CompanyName          = 'Evotec'
    CompatiblePSEditions = 'Desktop', 'Core'
    Copyright            = '(c) 2011 - 2020 Przemyslaw Klys @ Evotec. All rights reserved.'
    Description          = 'Mailing helper'
    FunctionsToExport    = 'Connect-IMAP', 'Connect-POP', 'Disconnect-IMAP', 'Disconnect-POP', 'Get-IMAPFolder', 'Get-IMAPMessage', 'Get-POPMessage', 'Save-POPMessage', 'Send-EmailMessage'
    GUID                 = '2b0ea9f1-3ff1-4300-b939-106d5da608fa'
    ModuleVersion        = '0.0.1'
    PowerShellVersion    = '5.1'
    PrivateData          = @{
        PSData = @{
            Tags                       = 'Windows', 'MacOS', 'Linux', 'Mail', 'Email'
            ExternalModuleDependencies = 'Microsoft.PowerShell.Utility'
        }
    }
    RequiredModules      = 'Microsoft.PowerShell.Utility'
    RootModule           = 'Mailozaurr.psm1'
}

It seems that when there's only one RequiredModules or ExternalModuleDependencies it is ignored by PowerShellGet. If there are more external module dependencies it will work.

Publish-PSArtifactUtility : PowerShellGet cannot resolve the module dependency 'Microsoft.PowerShell.Utility' of the module 'Mailozaurr' on the repository 'PSGallery'. Verify that the dependent module 'Microsoft.PowerShell.Utility' is available in the repository 'PSGallery'. If this dependent module 'Microsoft.PowerShell.Utility' is managed externally, add it to the Exter
nalModuleDependencies entry in the PSData section of the module manifest.
At C:\Users\przemyslaw.klys\Documents\WindowsPowerShell\Modules\PowerShellGet\2.2.1\PSModule.psm1:10944 char:17
+ ...             Publish-PSArtifactUtility @PublishPSArtifactUtility_Param ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Publish-PSArtifactUtility], InvalidOperationException
    + FullyQualifiedErrorId : UnableToResolveModuleDependency,Publish-PSArtifactUtility

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[danmetzler]

It appears to me this might not really be an issue. Both RequiredModules and ExternalModuleDependencies are supposed to take arrays. This provides a string value. RequiredModules = 'Microsoft.PowerShell.Utility' This provides an array value RequiredModules = @('Microsoft.PowerShell.Utility')

Does it fail when specifying an array?

[PrzemyslawKlys]

It fails only when it's a string value. Works fine with an array, including array with 1 element.