Fake fails when running dotnet outside the project

[JohBa]

Script reported an error:
-> BuildFailedException: Target 'Test' failed.
   StackTrace:
        at Fake.Core.TargetModule.runInternal(Boolean singleTarget, Int32 parallelJobs, String targetName, FSharpList`1 args) in D:\a\1\s\src\app\Fake.Core.Target\Target.fs:line 723
        at Fake.Core.TargetModule.runWithDefault$cont@795-1(Boolean allowArgs, FSharpFunc`2 fDefault, FSharpMap`2 results, Unit unitVar) in D:\a\1\s\src\app\Fake.Core.Target\Target.fs:line 827
        at <StartupCode$build_C5CD0E80EA481DD36D48431ECA1F02EC64BE699CF8CCFF02C55C930DD4A171D1>.$Build$fsx.main@() in C:\Repos\SomeCompany.Product\build.fsx:line 160
-> One or more errors occurred. (Could not find a part of the path 'C:\source\Services.CoreApp\Services.CoreApp.Service.MvcTests\global.json'.)
-> DirectoryNotFoundException: Could not find a part of the path 'C:\source\Services.CoreApp\Services.CoreApp.Service.MvcTests\global.json'.
   StackTrace:
        at System.IO.FileStream.ValidateFileHandle(SafeFileHandle fileHandle)
        at System.IO.FileStream.CreateFileOpenHandle(FileMode mode, FileShare share, FileOptions options)
        at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
        at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize)
        at System.IO.StreamWriter..ctor(String path)
        at System.IO.File.WriteAllText(String path, String contents)
        at Fake.DotNet.DotNet.withGlobalJson[a](String workDir, FSharpOption`1 version, FSharpFunc`2 f) in D:\a\1\s\src\app\Fake.DotNet.Cli\DotNet.fs:line 543
        at Fake.DotNet.DotNet.exec(FSharpFunc`2 buildOptions, String command, String args) in D:\a\1\s\src\app\Fake.DotNet.Cli\DotNet.fs:line 587
        at Build.runDotNet(String cmd, String workingDir) in C:\Repos\SomeCompany.Product\build.fsx:line 62
        at Build.clo@99-5.Invoke(TargetParameter _arg5) in C:\Repos\SomeCompany.Product\build.fsx:line 100
        at Fake.Core.TargetModule.runSimpleInternal(TargetContext context, Target target) in D:\a\1\s\src\app\Fake.Core.Target\Target.fs:line 195