Unable to append new file to a 7z archive, created with EncryptHeaders = True

[amarendrabiorad]

I am getting following exception while trying to append a new file to an existing password protected 7z archive.

Exception occurs while invoking CompressFilesEncrypted method in append mode, as shown in below snippet.

 var compressor = new new SevenZipCompressor(); 
 compressor.CompressionMode = CompressionMode.Append;
 compressor.CompressFilesEncrypted(zipFileName, fileID, fileToBeAdded);

The 7z archive is already created using below code.

var compressor = new SevenZipCompressor()
            {
                ArchiveFormat = OutArchiveFormat.SevenZip,
                CompressionMethod = CompressionMethod.Lzma2,
                CompressionLevel = CompressionLevel.Normal,
                EncryptHeaders = true,
            };
            compressor.CompressDirectory(folder, zipFileName, password);

Important point to notice, I am not facing the above issue if archive is created with EncryptHeaders = false;

A similar issue had been raised and already fixed for ModifyArchive function.... Here is a link to that issue.