Paket fails when adding <IncludeSymbols>true</IncludeSymbols> for SourceLink

Description

Paket version 5.194.0

I'm trying to add SourceLink to a NuGet package. When I add the following line to my .fsproj:

<IncludeSymbols>true</IncludeSymbols>

makes Paket.Restore.targets fail on line 253:

Repro steps

Please provide the steps required to reproduce the problem

1. Add this to the .fsproj file:

<IncludeSymbols>true</IncludeSymbols>

2. Run dotnet pack

See https://github.com/atlemann/MyNuget for repro. Uses Fake and Paket as global tools.

Expected behavior

The pack command to succeed and a NuGet package and symbols package to be built.

Actual behavior

Paket errors with:

C:\Users\aru\Documents\src\MyNuget\.paket\Paket.Restore.targets(253,5): error : The filename, directory name, or volume label syntax is incorrect : 'C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\obj\Release\MyFsNuget.1.2.3.nuspec;C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\obj\Release' [C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\MyFsNuget.fsproj]
PackTask: C:\Users\aru\Documents\src\MyNuget\.paket\Paket.Restore.targets(253,5): error : The filename, directory name, or volume label syntax is incorrect : 'C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\obj\Release\MyFsNuget.1.2.3.nuspec;C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\obj\Release'

or

C:\Users\aru\Documents\src\MyNuget\.paket\Paket.Restore.targets(253,5): error : The path 'C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\obj\Release\MyFsNuget.1.0.0.nuspec;C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\obj\Release\MyFsNuget.1.0.0.symbols.nuspec;C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\obj\Release\MyFsNuget.1.2.3.nuspec;C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\obj\Release' is too long, or a component of the specified path is too long. [C:\Users\aru\Documents\src\MyNuget\src\MyFsNuget\MyFsNuget.fsproj]

Known workarounds

None

Start with the repro repository and the .fsproj entry containing IncludeSymbols, then inspect .paket/Paket.Restore.targets around line 253 while running dotnet pack. Compare the generated paths in the reported error with the expected pack inputs. Done means dotnet pack succeeds and produces both the NuGet package and symbols package.