Extent Reports v3.1.3 AppendExisting does not work

[sundusnisar]

I have a project with 30 tests. I run it and report is generated. If 1 test fails, I only run that failed test again. The new generated report contains only last failed test.
I want to have all 30 tests of first report, with only failed tests replaced with last run test.

Here is the code am using

var path = System.Reflection.Assembly.GetCallingAssembly().CodeBase;
var actualPath = path.Substring(0, path.LastIndexOf("bin"));
var projectPath = new Uri(actualPath).LocalPath;
var reportPath = projectPath + "Reports\ExtentReport.html";
ExtentHtmlReporter htmlReporter = new ExtentHtmlReporter("ExtentReport.html");
htmlReporter.AppendExisting = true;
_extent = new ExtentReports();
_extent.AttachReporter(htmlReporter);

It makes no difference either I set true or false to htmlReporter.AppendExisting .
Any help is appreciated.

[anshooarora]

This feature will be available starting version 5.0. Please track #97.