Invoke-PnPSiteTemplate - A duplicate content type "Item" was found.

Category

[ x ] Bug
[ ] Enhancement

Environment

[ x ] SharePoint Online

Description

I get the error below when running the Invoke-PnPSiteTemplate with "Allow management of content types?" enabled on the source list.

• The source list might have been created importing an Excel (not sure if it makes any difference).
• All fields/views are the same in both lists. The only difference between the XML that throw the error and the one that don't is that the bad one has ContentTypesEnabled="true" set on pnp:ListInstance tag.
• When disabling the "Allow management of content types?" on source lists before generating the XML it works.
• It doesn't matter if "Allow management of content types?" is true or false on the destination list.
• It might have something to do with this fix: https://github.com/pnp/pnpframework/blob/0e90d4cface623aee90151f9557faf495d13f325/src/lib/PnP.Framework/Provisioning/ObjectHandlers/ObjectListInstance.cs#L1606-L1607

Error

PS C:\tmp> Invoke-PnPSiteTemplate -Path myList.xml
Invoke-PnPSiteTemplate : A duplicate content type "Item" was found.
At line:1 char:1
+ Invoke-PnPSiteTemplate -Path dev2.xml
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (:) [Invoke-PnPSiteTemplate], ServerException
    + FullyQualifiedErrorId : EXCEPTION,PnP.PowerShell.Commands.Provisioning.Site.InvokeSiteTemplate

Start in src/lib/PnP.Framework/Provisioning/ObjectHandlers/ObjectListInstance.cs around lines 1606-1607 and trace how Invoke-PnPSiteTemplate handles a pnp:ListInstance with ContentTypesEnabled="true". Reproduce with the provided XML conditions and verify that provisioning completes without the duplicate content type "Item" error.