Working Directory Diff not working

[Clindbergh]

Reproduction steps

In a repository run:

  repo.Diff.Compare<TreeChanges>(repo.Head.Tip.Tree, DiffTargets.WorkingDirectory)

// Working fine:
// repo.Diff.Compare<TreeChanges>(repo.Head.Tip.Tree, DiffTargets.Index | DiffTargets.WorkingDirectory)
// repo.Diff.Compare<TreeChanges>(repo.Head.Tip.Tree, DiffTargets.Index)

Expected behavior

List of changed files.

Actual behavior

Code does not stop.

Version of LibGit2Sharp (release number or SHA1)

Unknown

Operating system(s) tested; .NET runtime tested

Win 10, .Net 4.8