NU1505 appears in 17.3.0 Preview 1

[kuuhakumirai]

Describe the bug

NU1505: Duplicate 'PackageDownload' items warning is raised when the SDK uses PackageDownload to get packages.
The duplicate 'PackageDownload' items are: Microsoft.NETCore.App.Host.win-x64 [6.0.3], Microsoft.NETCore.App.Host.win-x64 [6.0.3], Microsoft.NETCore.App.Host.win-x64 [6.0.3], Microsoft.NETCore.App.Host.win-x64 [6.0.3].

I run into it in 17.3.0 Preview 1, and it doesnt appear in 17.2.0 with the same project.

To Reproduce

1. Use Microsoft.NETCore.App Version 6.0.3
2. Update Visual Studio to 17.3.0 Preview 1
3. The warning "warning NU1505: Duplicate 'PackageDownload' items found. Remove the duplicate items or use the Update functionality to ensure a consistent restore behavior" occurs as below screenshot.
4. It doesnt appear in 17.2.0 with the same project.
5. I notice that a closed issue described this symptom: NU1505: Duplicate 'PackageDownload' items warning is raised when the SDK uses PackageDownload to get packages.  #24747

They are the same project:

Using .NET SDK 6.0.300 I think.

Further technical details

• Include the output of dotnet --info
• The IDE (VS / VS Code/ VS4Mac) you're running on, and its version

[marbel82]

I have a similar warning:

Warning NU1505 Duplicate 'PackageDownload' items found. Remove the duplicate items or use the Update functionality to ensure a consistent restore behavior. The duplicate 'PackageDownload' items are: Microsoft.NETCore.App.Host.win-x64 [6.0.0], Microsoft.NETCore.App.Host.win-x64 [6.0.0], Microsoft.NETCore.App.Host.win-x64 [6.0.0], Microsoft.NETCore.App.Host.win-x64 [6.0.0].

[baronfel]

This is a duplicate of #24747, and I've commented more about why this is appearing and what folks can do to resolve it ahead of a proper fix here.