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dotnet workload restore fails when encountering solution folder

See original GitHub issue

Describe the bug

Try running dotnet workload restore on a solution which has Solution Folders containing Projects. Observe the attached stacktrace.

To Reproduce

Run dotnet workload restore on this solution: repro.zip

Exceptions (if any)

Stacktrace

Microsoft.Build.Exceptions.InvalidProjectFileException: The project file could not be loaded. Could not find file '/path/to/folder'.  /path/to/folder
 ---> System.IO.FileNotFoundException: Could not find file '/path/to/folder'.
File name: '/path/to/folder'
   at Interop.ThrowExceptionForIoErrno(ErrorInfo errorInfo, String path, Boolean isDirectory, Func`2 errorRewriter)
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String path, OpenFlags flags, Int32 mode)
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize)
   at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize)
   at System.IO.Strategies.FileStreamHelpers.ChooseStrategy(FileStream fileStream, String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, Int64 preallocationSize)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at Microsoft.Build.Internal.XmlReaderExtension..ctor(String file, Boolean loadAsReadOnly)
   at Microsoft.Build.Construction.ProjectRootElement.LoadDocument(String fullPath, Boolean preserveFormatting, Boolean loadAsReadOnly)
   --- End of inner exception stack trace ---
   at Microsoft.Build.Shared.ProjectFileErrorUtilities.VerifyThrowInvalidProjectFile(Boolean condition, String errorSubCategoryResourceName, BuildEventFileInfo projectFile, Exception innerException, String resourceName, Object[] args)
   at Microsoft.Build.Shared.ProjectFileErrorUtilities.ThrowInvalidProjectFile(BuildEventFileInfo projectFile, Exception innerException, String resourceName, Object[] args)
   at Microsoft.Build.Construction.ProjectRootElement.LoadDocument(String fullPath, Boolean preserveFormatting, Boolean loadAsReadOnly)
   at Microsoft.Build.Construction.ProjectRootElement..ctor(String path, ProjectRootElementCacheBase projectRootElementCache, Boolean preserveFormatting)
   at Microsoft.Build.Construction.ProjectRootElement.CreateProjectFromPath(String projectFile, ProjectRootElementCacheBase projectRootElementCache, Boolean preserveFormatting)
   at Microsoft.Build.Construction.ProjectRootElement.<>c.<OpenProjectOrSolution>b__208_0(String path, ProjectRootElementCacheBase cache)
   at Microsoft.Build.Evaluation.ProjectRootElementCache.Get(String projectFile, OpenProjectRootElement loadProjectRootElement, Boolean isExplicitlyLoaded, Nullable`1 preserveFormatting)
   at Microsoft.Build.Construction.ProjectRootElement.OpenProjectOrSolution(String fullPath, IDictionary`2 globalProperties, String toolsVersion, ProjectRootElementCacheBase projectRootElementCache, Boolean isExplicitlyLoaded)
   at Microsoft.Build.Execution.ProjectInstance..ctor(String projectFile, IDictionary`2 globalProperties, String toolsVersion, String subToolsetVersion, ProjectCollection projectCollection, Nullable`1 projectLoadSettings, EvaluationContext evaluationContext)
   at Microsoft.Build.Execution.ProjectInstance..ctor(String projectFile, IDictionary`2 globalProperties, String toolsVersion)
   at Microsoft.DotNet.Workloads.Workload.Restore.WorkloadRestoreCommand.RunTargetToGetWorkloadIds(IEnumerable`1 allProjects)
   at Microsoft.DotNet.Workloads.Workload.Restore.WorkloadRestoreCommand.Execute()
   at Microsoft.DotNet.Cli.DotNetTopLevelCommandBase.RunCommand(String[] args)
   at Microsoft.DotNet.Workloads.Workload.WorkloadCommand.Run(String[] args)
   at Microsoft.DotNet.Cli.Program.ProcessArgs(String[] args, TimeSpan startupTime, ITelemetry telemetryClient)
   at Microsoft.DotNet.Cli.Program.Main(String[] args)

Further technical details

➜  Projects dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.202
 Commit:    f8a55617d2

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  12.4
 OS Platform: Darwin
 RID:         osx.12-x64
 Base Path:   /usr/local/share/dotnet/sdk/6.0.202/

Host (useful for support):
  Version: 6.0.5
  Commit:  70ae3df4a6

.NET SDKs installed:
  3.1.418 [/usr/local/share/dotnet/sdk]
  3.1.419 [/usr/local/share/dotnet/sdk]
  5.0.200 [/usr/local/share/dotnet/sdk]
  5.0.407 [/usr/local/share/dotnet/sdk]
  5.0.408 [/usr/local/share/dotnet/sdk]
  6.0.201 [/usr/local/share/dotnet/sdk]
  6.0.202 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.24 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.25 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.16 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.17 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.4 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.0-preview.2.22153.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.24 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.25 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.16 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.17 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]