Project cannot be loaded when folder name contains a `#`

[peterzeller]

I created a new project with dotnet new classlib -lang F# in a folder named /home/peter/Desktop/F#-learning. When I try to open the folder in vscode I get the following exception in the language server log:

Listening on stdin
Add workspace root /home/peter/Desktop/F
Exception in language server System.IO.DirectoryNotFoundException: Could not find a part of the path '/home/peter/Desktop/F'.
   at System.IO.UnixFileSystem.FileSystemEnumerable`1.OpenDirectory(String fullPath)
   at System.IO.UnixFileSystem.FileSystemEnumerable`1.Enumerate()
   at System.IO.UnixFileSystem.FileSystemEnumerable`1..ctor(String userPath, String searchPattern, SearchOption searchOption, SearchTarget searchTarget, Func`3 translateResult)
   at System.IO.UnixFileSystem.EnumerateFileSystemInfos(String fullPath, String searchPattern, SearchOption searchOption, SearchTarget searchTarget)
   at System.IO.DirectoryInfo.InternalEnumerateFiles(String searchPattern, SearchOption searchOption)
   at System.IO.DirectoryInfo.EnumerateFiles(String searchPattern, SearchOption searchOption)
   at <StartupCode$FSharpLanguageServer>.$ProjectManager.AddWorkspaceRoot@371.Invoke(Unit unitVar) in /Users/georgefraser/Documents/fsharp-language-server/src/FSharpLanguageServer/ProjectManager.fs:line 371
   at Microsoft.FSharp.Control.AsyncBuilderImpl.callA@522.Invoke(AsyncParams`1 args)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.FSharp.Control.AsyncBuilderImpl.commit[a](AsyncImplResult`1 res)
   at Microsoft.FSharp.Control.CancellationTokenOps.RunSynchronouslyInCurrentThread[a](CancellationToken token, FSharpAsync`1 computation)
   at Microsoft.FSharp.Control.CancellationTokenOps.RunSynchronously[a](CancellationToken token, FSharpAsync`1 computation, FSharpOption`1 timeout)
   at Microsoft.FSharp.Control.FSharpAsync.RunSynchronously[T](FSharpAsync`1 computation, FSharpOption`1 timeout, FSharpOption`1 cancellationToken)
   at LSP.LanguageServer.connect(FSharpFunc`2 serverFactory, BinaryReader receive, BinaryWriter send) in /Users/georgefraser/Documents/fsharp-language-server/src/LSP/LanguageServer.fs:line 213
   at FSharpLanguageServer.Program.main(String[] argv) in /Users/georgefraser/Documents/fsharp-language-server/src/FSharpLanguageServer/Program.fs:line 842