Net 8.0 RC During build System.Text.Json NuGet isn't copied to bin folder (in net 7.0 its still copied)

[GC-Configit]

Describe the bug

When I'm using net 8.0 RC during build I don't get System NuGet dlls in the bin folder. For net 7.0 I would get it, thats why I'm assuming it's a bug.

To Reproduce

Simply create a new console application. Change <TargetFramework>net8.0</TargetFramework> to <TargetFrameworks>net8.0;net7.0</TargetFrameworks> Add System.Text.Json package. Build the project and then compare bin folders:

• in net7.0 folder there would be System.Text.Encodings.Web.dll and System.Text.Json.dll
• in net8.0 folder there won't be those dlls

[marcpopMSFT]

I believe this is by design since those components come from the runtime. I recall seeing a change for this but can't find it at the moment where we changed the behavior to no longer copy binaries we didn't need since for a framework-dependent application, we can load that file from the shared framework directly. @baronfel @dsplaisted do ya'll recall that change?

[petertiedemann]

@marcpopMSFT This should be the same issue btw: #35817

[dsplaisted]

I believe this is by design since those components come from the runtime. I recall seeing a change for this but can't find it at the moment where we changed the behavior to no longer copy binaries we didn't need since for a framework-dependent application, we can load that file from the shared framework directly. @baronfel @dsplaisted do ya'll recall that change?

I don't think this is a recent change. I think the difference in behavior between .NET 7 and .NET 8 for this example is that the referenced NuGet package is newer than .NET 7 but not newer than the version of .NET 8 being used. When a NuGet package is referenced that includes an assembly that is also part of the shared framework, the .NET SDK will compare the versions of that assembly. If the NuGet package has a newer version than what's in the shared framework, then the assembly will be included in the output. Otherwise, it won't be included. (We refer to this process as conflict resolution).

[marcpopMSFT]

Resolved per Daniel's comments

[GC-Configit]

Thank you guys for the information :)