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Reproduction steps

var dir = Path.GetTempPath() + Path.GetRandomFileName();
Repository.Init(dir);
Repository r = new Repository(dir);
Blob empty = r.ObjectDatabase.CreateBlob(new MemoryStream());
var td = new TreeDefinition();
td.Add("a/b/c", empty, Mode.NonExecutableFile);
td.Remove("a");
bool presentInTreeDefinition = td["a"] != null;
Tree t = r.ObjectDatabase.CreateTree(td);
bool presentInTree = t["a"] != null;

Expected behavior

Both presentInTreeDefinition and presentInTree should be false.

Actual behavior

presentInTreeDefinition is false, but presentInTree is true.

Version of LibGit2Sharp (release number or SHA1)

0.26.2

Operating system(s) tested; .NET runtime tested

Windows 10, .NET Core 3.1