dotnet pack fails with paket and .NET Core 2.1.500

Description

Get the error message when running dotnet pack with .NET Core 2.1.500:

/Users/dbrattli/Developer/GitHub/classlib/.paket/Paket.Restore.targets(226,5): error : The provided SymbolPackageFormat value  is invalid. Allowed values : 'snupkg', 'symbols.nupkg'. [/Users/dbrattli/Developer/GitHub/classlib/classlib.csproj]

I have no idea is this is an issue is related to dotnet and/or paket. Tested on Mac OS X 14.4.1, and Windows 10, and get the same error on three different machines and installations.

Repro steps

1. Install .NET Core 2.1.500, https://www.microsoft.com/net/download

2. dotnet new classlib -o myproject

3. Add paket to new project and initialize. Add a nuget to dependencies so project file classlib.csproj imports Paket.Restore.targets`:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
  </PropertyGroup>
  <Import Project=".paket\Paket.Restore.targets" />
</Project>

1. dotnet restore

2. dotnet build

3. dotnet pack

Expected behavior

Expected behavior is that dotnet pack completes without error. This used to work in earlier versions of dotnet.

Actual behavior

➜  classlib dotnet pack                  
Microsoft (R) Build Engine version 15.9.20+g88f5fadfbe for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  shasum: /Users/dbrattli/Developer/GitHub/classlib/.paket/../paket-files/paket.restore.cached: 
  Paket version 5.188.1
  Starting full restore process.
  Performance:
   - Disk IO: 17 milliseconds
   - Runtime: 2 seconds
  Restoring packages for /Users/dbrattli/Developer/GitHub/classlib/classlib.csproj...
  Restore completed in 178.88 ms for /Users/dbrattli/Developer/GitHub/classlib/classlib.csproj.
  Paket version 5.188.1
  The last restore is still up to date. Nothing left to do.
  Performance:
   - Runtime: 60 milliseconds
  classlib -> /Users/dbrattli/Developer/GitHub/classlib/bin/Debug/netstandard2.0/classlib.dll
  Paket version 5.188.1
  Performance:
   - Runtime: 644 milliseconds
/Users/dbrattli/Developer/GitHub/classlib/.paket/Paket.Restore.targets(226,5): error : The provided SymbolPackageFormat value  is invalid. Allowed values : 'snupkg', 'symbols.nupkg'. [/Users/dbrattli/Developer/GitHub/classlib/classlib.csproj]

Known workarounds

Don’t know any workarounds. Downgrading dotnet might work.

[MarkNicholls]

so just for advice to others, my workaround is to copy the paket.restore.targets and add SymbolPackageFormat line as described above and then amend my projects to import this amended file rather than the default one. Hopefully will get a fix and undo this, it only affects a few of my projects

[forki]

So apparently my fix wasn’t good enough. https://github.com/fsprojects/Paket/issues/3429

Any ideas?