Site Columns added by Add-PnpField not showing up in Highlighted Content webpart

[Constey]

Hi there,

i'm getting stuck in creating some custom colums for the "Site Pages" library - to deploy some colums automatically.
I can create collumns by pnp like this:

$siteurl = "https://domain.sharepoint.com/sites/2501"
Connect-PnPOnline -Url $SiteURL -Interactive
$SitePagesList = Get-PNPList |? { $_.Title -eq "Websiteseiten" -or $_.Title -eq "SitePages" }
$DisplayName = "Redakteur"
$PNPField = Add-PnPField -List $SitePagesList -InternalName $DisplayName -DisplayName $DisplayName -Type User -AddToDefaultView -Required -AddToAllContentTypes
[XML]$SchemaXml = $PNPField.SchemaXml
$SchemaXml.Field.SetAttribute("Mult","TRUE")
$SchemaXml.Field.SetAttribute("UserDisplayOptions","NamePhoto")
$OuterXML = $SchemaXml.OuterXml.Replace('Field Type="User"','Field Type="UserMulti"')
Set-PnPField -List $SitePagesList -Identity $PNPField.Id -Values @{SchemaXml =$OuterXML} -UpdateExistingLists

They show up correctly under site pages:

But I cant select the column "Redakteur" in the Webpart "Highlighted Content":

In the webpart only from hand created properties show up. Am i wrong here somehow?
If I compare the ouput of both fields from:
Get-PnPField -List $SitePagesList -Identity "XXXXXXX-be4a-429b-9b2a-6207e7f85535" | fl *
I dont see a big difference. I've aswell tried creating the field and setting the difference options like UserSelectionMode. But this didn't make a difference.

Does anybody out there has an idea what is wrog here?

Or otherwise how I can deploy some custom colums for the existing site pages library?
I've tried this aswell with the command below, but this creates me a new Page Library with the same name instead of updating the "original" one. Seems a bug in PNP Powershell ?

$siteScript = ....
        "verb": "createSPList",
        "listName": "Site Pages",
        "templateType": 119,
        "subactions": [
          {
            "displayName": "Redakteur",
            "isRequired": true,
            "addToDefaultView": false,
            "fieldType": "User",
            "enforceUnique": false,
            "verb": "addSPField"
          },
.....
Invoke-PnPSiteScript -WebUrl $siteurl -Script $siteScript

Kind regards,
Constantin