I've found pages that for one reason or another are missing the Title Area with the banner. In order to get that back, I just run the following on it (replacing the ID with the ID of the page you're trying to get):
$SiteURL = "https://vivity.sharepoint.com/sites/Test"
$ID = 12
Connect-PnPOnline $SiteURL -Credential (Get-Credential)
Get-PnPListItem -List SitePages
Set-PnPListItem -List SitePages -Identity $ID -Values @{"PageLayoutType"="Article"}