Warning in MAUI when referencing a project with GenerateDocumentationFile true

Description

If you create a project reference from a MAUI project to a class library, and that project is generating XML documentation files, you get the following build warnings - two for each reference (one for iOS, one for maccatalyst):

Xamarin.Shared.Sdk.targets(1439, 3): The file '/Users/matt/Code/MyMauiApp/ClassLibrary1/bin/Debug/net6.0/ClassLibrary1.xml' does not specify a 'PublishFolderType' metadata, and a default value could not be calculated. The file will not be copied to the app bundle.
Xamarin.Shared.Sdk.targets(1439, 3): The file '/Users/matt/Code/MyMauiApp/ClassLibrary1/bin/Debug/net6.0/ClassLibrary1.xml' does not specify a 'PublishFolderType' metadata, and a default value could not be calculated. The file will not be copied to the app bundle.

Steps to Reproduce

1. Create a new MAUI app (dotnet new maui, etc.)
2. Add a class library project to the same solution
3. Put some XML summary comments on the public members in that class library project.
4. Set <GenerateDocumentationFile>true</GenerateDocumentationFile> (per this) in the csproj for the class library project
5. Reference the class library project from the MAUI app.
6. Compile and see the warnings

Version with bug

Release Candidate 3 (current)

Last version that worked well

Unknown/Other

Affected platforms

iOS, macOS

Affected platform versions

any

Did you find any workaround?

I think this may be related or similar to https://github.com/xamarin/xamarin-macios/issues/14939, but the workaround there did not work for me, and I’m not sure if this is MAUI specific or not.

Relevant log output

No response

[jfversluis]

If it also happens on iOS without .NET MAUI involved then yes please move it there. Thanks!

[mattjohnsonpint]

FYI, this happens not just on MAUI, but also with an app made via dotnet new ios. Should I close this and open a new issue on https://github.com/xamarin/xamarin-macios?