Nuget warning nu5131nuspec and ref folders - I don't see these folders in other plugins

[dubnemo]

https://learn.microsoft.com/en-us/nuget/reference/errors-and-warnings/nu5131

/usr/lib/dotnet/sdk/8.0.114/Sdks/NuGet.Build.Tasks.Pack/buildCrossTargeting/NuGet.Build.Tasks.Pack.targets(221,5): warning NU5131: References were found in the nuspec, but some reference assemblies were not found in both the nuspec and ref folder. Add the following reference assemblies: [/home/dubnemo/ShippedItemInstancePlugin/ShippedItemInstancePlugin/ShippedItemInstancePlugin.csproj]
/usr/lib/dotnet/sdk/8.0.114/Sdks/NuGet.Build.Tasks.Pack/buildCrossTargeting/NuGet.Build.Tasks.Pack.targets(221,5): warning NU5131: - Add AgGateway.ADAPT.ShippedItemInstancePlugin.dll to the ref/any/ directory [/home/dubnemo/ShippedItemInstancePlugin/ShippedItemInstancePlugin/ShippedItemInstancePlugin.csproj]
/usr/lib/dotnet/sdk/8.0.114/Sdks/NuGet.Build.Tasks.Pack/buildCrossTargeting/NuGet.Build.Tasks.Pack.targets(221,5): warning NU5131: [/home/dubnemo/ShippedItemInstancePlugin/ShippedItemInstancePlugin/ShippedItemInstancePlugin.csproj]

[dubnemo]

This warning is still open from #26
Not able to resolve at this time.

@knelson-farmbeltnorth @strhea