Reproduction of a bug in ssh2 when using agent forwarding

Agent-forwarding.js

var Connection = require('ssh2');
var conn = new Connection();
 
conn.on('ready', function() {
  exec(conn, 'pwd', function () {
    exec(conn, 'pwd', function () {
      conn.end();
    });
  });
});

conn.on('keyboard-interactive', function (_0, _1, _2, prompt, callback) {
  callback(['***']);
});

conn.connect({
  host: '1.2.3.4',
  username: 'me',
  agent: process.env.SSH_AUTH_SOCK,
  agentForward: true,
  tryKeyboard: true
});

function exec (conn, command, callback) {
  conn.exec(command, function(err, stream) {
    if (err) throw err;
    stream.on('data', function(data, stderr) {
      if (stderr)
        console.log('STDERR: ' + data);
      else
        console.log('STDOUT: ' + data);
    }).on('exit', function(exitcode) {
      callback();
    });
  });
}

output.txt

{ '0': '',
  '1': '',
  '2': '',
  '3': [ { prompt: 'Password:', echo: false } ],
  '4': [Function] }
STDOUT: /a/path


/Users/andreashultgren/Documents/Projects/Temp/sshtest.js:31
    if (err) throw err;
                   ^
Error: Unable to request agent forwarding
    at /Users/andreashultgren/Documents/Projects/Temp/node_modules/ssh2/lib/Channel.js:198:17
    at Parser.<anonymous> (/Users/andreashultgren/Documents/Projects/Temp/node_modules/ssh2/lib/Channel.js:128:30)
    at Parser.EventEmitter.emit (events.js:92:17)
    at Parser.parsePacket (/Users/andreashultgren/Documents/Projects/Temp/node_modules/ssh2/lib/Parser.js:637:12)
    at Parser.execute (/Users/andreashultgren/Documents/Projects/Temp/node_modules/ssh2/lib/Parser.js:249:14)
    at Socket.<anonymous> (/Users/andreashultgren/Documents/Projects/Temp/node_modules/ssh2/lib/Connection.js:521:18)
    at Socket.EventEmitter.emit (events.js:95:17)
    at Socket.<anonymous> (_stream_readable.js:745:14)
    at Socket.EventEmitter.emit (events.js:92:17)
    at emitReadable_ (_stream_readable.js:407:10)