stderr always coming in stdout

Hi,

I have faced an issue, which always returns stderr in result.stdout rather than result.stderr.
node-ssh version 10.0.2

ssh.connect({
  host: 'localhost',
  username: '<username>',
  password: '<password>'
}).then(() => {
  ssh.exec('sudo apt updat', [], {
    execOptions: { pty : true },
    stdin: '<password>\n',
    stream: 'both'
  }).then((result) => {
    console.log("Result StdOut", result.stdout)
    console.log("Result StdErr", result.stderr)
    console.log("Result", result)
  })
})

Note: Intensively I make an error in the command sudo apt updat to expecting error.

When I execute above code I got the error always in the stdout.

Result StdOut 
[sudo] password for <username>: 
E: Invalid operation updat
Result StdErr 
Result {
  code: 100,
  signal: null,
  stdout: '<password>\r\n' +
    '[sudo] password for <username>: \r\n' +
    '\u001b[1;31mE: \u001b[0mInvalid operation updat\u001b[0m',
  stderr: ''
}

But the same is working expected using ssh2
Below is the sample.

var Client = require('ssh2').Client;
 
var conn = new Client();
conn.on('ready', function() {
  console.log('Client :: ready');
  conn.exec('apt updat', function(err, stream) {
    if (err) throw err;
    stream.on('close', function(code, signal) {
      console.log('Stream :: close :: code: ' + code + ', signal: ' + signal);
      conn.end();
    }).on('data', function(data) {
      console.log('STDOUT: ' + data);
    }).stderr.on('data', function(data) {
      console.log('STDERR: ' + data);
    });
  });
}).connect({
  host: 'localhost',
  port: 22,
  username: '<username>',
  password: '<password>'
});

Output is

STDERR: 
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.


STDERR: E: Invalid operation updat
STDERR: 

Stream :: close :: code: 100, signal: undefined

Start at the ssh.exec entry point with the reported pty, stdin, and stream: 'both' options, then trace how the command's output is assigned to result.stdout and result.stderr. Reproduce the sudo apt updat case and confirm that the error text is separated into result.stderr while the exit code remains 100.