paket pack not functioning with net5.0 and mac

Description

It's not possible to use paket pack to package a nugget based on net5.0

Repro steps

using the following msbuild file

<?xml version="1.0" encoding="utf-8"?> <Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <RootNamespace>Small</RootNamespace> <OutputType>Library</OutputType> <TargetFramework>net5.0</TargetFramework> </PropertyGroup> <ItemGroup> <Compile Include="Environment.fs" /> </ItemGroup> <Import Project="..\.paket\Paket.Restore.targets" /> </Project>

1. run dotnet paket pack --version 1.2.0 .

Expected behavior

I would expect it to create the package/ a result similar to dotnet pack -c Release which succeeds

Actual behavior

The result is an error message Paket failed with -> Unable to find Release output path node in file <project_file_path>

Known workarounds

No known work arounds
Adding a specific OutputPath in the project file like <OutputPath>$(Configuration)/bin</OutputPath> removes the error message but the dll is not included in the nupkg (actually the entire lib folder Is missing)

dotnet version 5.0.100
OS: MacOS Big Sur 11.2.2
paket version 5.257

Reproduce the issue with the provided MSBuild project, the net5.0 target, macOS, and dotnet paket pack --version 1.2.0 .; compare it with dotnet pack -c Release. Trace how Paket locates the Release output path and builds the package. Done means the command succeeds and the nupkg contains the library DLL under its lib folder.