Missing NestedModules after updating manifest

NestedModules.ps1

$originalManifestPath = Join-Path $PSScriptRoot 'Original.psd1'
$updatedManifestPath = Join-Path $PSScriptRoot 'Updated.psd1'

'function Get-Root { Write-Host "Root" }' | Set-Content -Path 'RootModule.psm1'
'function Get-Nested { Write-Host "Nested" }' | Set-Content -Path 'NestedModule.psm1'

New-ModuleManifest `
    -Path $originalManifestPath `
    -NestedModules @('NestedModule.psm1') `
    -RootModule 'RootModule.psm1' `
    -FunctionsToExport @('Get-Root', 'Get-Nested') `
    -CmdletsToExport @() `
    -VariablesToExport @() `
    -AliasesToExport @()

Copy-Item `
    -Path $originalManifestPath `
    -Destination $updatedManifestPath `
    -Force

Update-ModuleManifest `
    -Path $updatedManifestPath

$originalManifest = Import-PowerShellDataFile -Path $originalManifestPath
$updatedManifest = Import-PowerShellDataFile -Path $updatedManifestPath

Write-Host 'Original:' $originalManifest.NestedModules
Write-Host 'Updated:' $updatedManifest.NestedModules