Get-PnPSiteTemplate fails when used on site created with a default template

Error description

I've created a communication site, with the default site template "Department" applied. No further modifications have been made to site.

When trying to extract the site template from a communication site with all site pages, it fails with the following error message:

Get-PnPSiteTemplate : The JSON value could not be converted to System.Int32. Path:      
$.position.sectionIndex | LineNumber: 0 | BytePositionInLine: 107.

The error message appears when PnP is trying to extract the client side page contents, so I assume, the JSON of the default pages contains data, which does not follow the schema PnP is expecting.

The used command is
Get-PnPSiteTemplate -Out "template.xml" -IncludeAllClientSidePages

Steps to reproduce

• Make sure, you have the latest PnP.PowerShell installed (in my case 1.11.0)
• Create a new communication site (English language)
• When you first open the site, select "Browse templates" in the upcoming dialog
• Select the "Department" template and wait, until it is applied completely
• Connect to the site using PnP with Connect-PnPOnline https://yourtenant.sharepoint.com/sites/yoursite -Interactive
• Extract a template including all site pages with Get-PnPSiteTemplate -Out "template.xml" -IncludeAllClientSidePages

Reproduce the failure with Connect-PnPOnline and Get-PnPSiteTemplate using -IncludeAllClientSidePages on a communication site with the Department template. Start by tracing the client-side page extraction and the JSON value at position.sectionIndex; done means the complete template, including all site pages, is extracted without the Int32 conversion error.