APPX0702 when csproj reference vcxproj which output only winmd

[wherewhere]

Description

When reference a pure winmd vcxproj project to a package csproj such as UWP or WAS, it always including the not exist .dll file, which cause the APPX0702 error.

Steps To Reproduce

1. Create a pure winmd vcxproj such as https://github.com/SharpAdb/AdvancedSharpAdbClient.SampleApp/blob/main/SharpADB/SharpADB.Metadata/SharpADB.Metadata.vcxproj
2. Reference it

Expected Behavior

Works fine.

Version Info

• Microsoft.Windows.CsWinRT 2.2.0
• Microsoft.Windows.SDK.BuildTools 10.0.26100.4654
• Microsoft.Windows.SDK.BuildTools.MSIX 1.7.20250806.1

Additional Context

I don't know which project is for Microsoft.Windows.SDK.BuildTools, but this is a csproj problem so I write the issue here. If this issue is in wrong place, please move it to the right one.