Do framework conditional references in paket.references work with .NET SDK-style projects? #3091

I've had trouble getting conditional references in paket.references working in the context of .NET SDK-style projects. Roughly speaking I had this in paket.references:

Nancy.Hosting.Self framework: net461

But I still get this error for when compiling TargetFramework=netcoreapp2.0 for a multi-targeting project:

C:\GitHub\dsyme\FSharp.Data\tests\FSharp.Data.Tests\FSharp.Data.Tests.fsproj : error NU1701: 
Package 'Nancy.Hosting.Self 2.0.0-clinteastwood' was restored using '.NETFramework,Version=v4.6.1' 
instead of the project target framework '.NETCoreApp,Version=v2.0'. This package may not be fully
compatible with your project.

I would have thought that the framework: net461 would suppress the reference for netcoreapp2.0?