Invoke-PnPSiteTemplate doesn't retain client side page header settings

Reporting an Issue or Missing Feature

Modern Page and Page Template headers are not applied correctly upon Invoke-PnPSiteTemplate.

Expected behavior

Page is copied with the header settings retained.

Actual behavior

Page is copied with webparts and sections, however the header settings are not retained.

Steps to reproduce behavior

$clientId = ""
$clientSecret = ""
$sourceSiteUrl = ""
$targetSiteUrl = ""
Connect-PnPOnline $sourceSiteUrl -ClientId $clientId -ClientSecret $clientSecret

$basetemplate = Get-PnPSiteTemplate -IncludeAllClientSidePages -Handlers PageContents,Pages -OutputInstance -Schema LATEST

$template = New-PnPSiteTemplate
foreach($page in $basetemplate.ClientSidePages)
{
$page.PageName
if ($page.PageName -eq "Sample-Page-For-PnP-Copy.aspx") {
$template.ClientSidePages.Add($page)
$templatePage = $template.ClientSidePages[$template.ClientSidePages.Count - 1]
$page.Header.TextAlignment
$templatePage.Header.TextAlignment
}
<#
if($page.PromoteAsTemplate -eq $true)
{
Write-Host "^^^^^^^ TEMPLATE ^^^^^^"

    $template.ClientSidePages.Add($page)
    $templatePage = $template.ClientSidePages[$template.ClientSidePages.Count - 1]
    $page.Header.TextAlignment
    $templatePage.Header.TextAlignment
}
#>

}

<# inspect the template properties before applying and note that they are correct #>
$template.ClientSidePages[0].PageName
$template.ClientSidePages[0].Header.TextAlignment
$template.ClientSidePages[0].Header.LayoutType

$template.Files.AddRange($basetemplate.Files)

Connect-PnPOnline -Url $targetSiteUrl -ClientId $clientId -ClientSecret $clientSecret
Invoke-PnPSiteTemplate -InputInstance $template -Connection $connection -Handlers PageContents, Pages

What is the version of the Cmdlet module you are running?

1.6.0

Which operating system/environment are you running PnP PowerShell on?

• [ X] Windows

Start by reproducing the issue with Get-PnPSiteTemplate and Invoke-PnPSiteTemplate using the provided PowerShell example, comparing the page Header properties before and after applying the template. Trace the Pages and PageContents handling, then verify that copied modern pages retain their header settings.