Create a duplicat site using "Get-PnPSiteTemplate" will not copy the cusotm site permissions and the list indexes

[mvcsharepointdev]

I have a sharepoint site named "source" and i want to create a duplicate site for it named "duplicate", so i run the below commands:-

`Connect-PnPOnline -Url "https://*****.sharepoint.com/sites/source" -interactive

Get-PnPSiteTemplate -Out "PnP-Provisioning-File.xml"

Connect-PnPOnline -Url "https://****.sharepoint.com/sites/duplicate" -interactive

Invoke-PnPSiteTemplate -Path "PnP-Provisioning-File.xml"
`
But i have noted that these 2 things will not be copied:-

1. custom SharePoint groups which have custom permission levels, where i will get these errors, during the Invoke process:-

    WARNING: Cannot find principal 'Source-PPM Contributors', cannot grant permissions
    WARNING: Cannot find principal 'Source-PPM Contributors without Delete', cannot grant permissions
    WARNING: Cannot find principal 'Source-PPM Contributors without Delete & Create', cannot grant permissions

2. list indexes

so is there a way to fix this?

Thanks