Traversal SDK ignores SetTargetFramework metadata on ProjectReference

I have a traversal that is responsible for build and publishing of projects. As such, any references to multi-targeting projects must be referenced with the TargetFramework global property explicitly set, to avoid a build error like this:

C:\Users\User\agent_work_tool\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.CrossTargeting.targets(31,5): error NETSDK1129: The 'Publish' target is not supported without specifying a target framework. The current project targets multiple frameworks, you must specify one of the following frameworks in order to publish: net8.0, net8.0-windows10.0.22621.0, net8.0-macOS [C:\Users\User\agent_work\1\s\src\Nerdbank.Zcash.App\Nerdbank.Zcash.App.Desktop\Nerdbank.Zcash.App.Desktop.csproj]

So I set the typical ProjectReference metadata to target just the TargetFramework appropriate for the build agent:

<SetTargetFramework>TargetFramework=net8.0-windows10.0.22621.0</SetTargetFramework>

But this was totally ignored, and the project built without TargetFramework set, and it failed on Publish.

Start with the traversal that builds and publishes projects and the ProjectReference metadata containing SetTargetFramework; reproduce the publish failure described in the issue. The work is done when the specified TargetFramework is honored for the multi-targeting reference and publishing no longer fails with NETSDK1129.