Failsafe option doesn't work for SSH Auth Failure about flightplan HOT 6 CLOSED

{ Error: All configured authentication methods failed
    at tryNextAuth ({path-to-my-project}/node_modules/ssh2/lib/client.js:294:17)
    at SSH2Stream.onUSERAUTH_FAILURE ({path-to-my-project}/node_modules/ssh2/lib/client.js:473:5)
    at emitTwo (events.js:106:13)
    at SSH2Stream.emit (events.js:194:7)
    at parsePacket ({path-to-my-project}/node_modules/ssh2-streams/lib/ssh.js:3647:10)
    at SSH2Stream._transform ({path-to-my-project}/node_modules/ssh2-streams/lib/ssh.js:551:13)
    at SSH2Stream.Transform._read (_stream_transform.js:167:10)
    at SSH2Stream._read ({path-to-my-project}/node_modules/ssh2-streams/lib/ssh.js:212:15)
    at SSH2Stream.Transform._write (_stream_transform.js:155:12)
    at doWrite (_stream_writable.js:329:12)
    at writeOrBuffer (_stream_writable.js:315:5) level: 'client-authentication' }

$ node --version; fly --version
v7.8.0
0.6.15

#-----
$ cat flightplan.js
var plan = require('flightplan')

plan.target('test', [
  {
    host: 'nohost',
    failsafe: true,
    user: 'root'
  },
  {
    host: '<host that exists>',
    port: 22,
    user: 'root',
    failsafe: true
  },
  {
    host: ‘<host that exists>’,
    port: xxx,
    user: ‘my_username’,
    agent: 'process.env.SSH_AUTH_SOCK',
    password: 'xyz',
    failsafe: true
  },
  {
    host: 'foobarfofofo',
    failsafe: true,
    user: 'root'
  }
])

plan.remote(function (remote) {
  remote.exec('ls -al')
})
$ fly test
✈ Running default:test
✈ Connecting to 'nohost'
✈ Connecting to '<host that exists>'
✈ Connecting to '<host that exists>'
✈ Connecting to 'foobarfofofo'
● Safely failed connecting to 'nohost': getaddrinfo ENOTFOUND nohost nohost:22
● Safely failed connecting to '<host that exists>': getaddrinfo ENOTFOUND <host that exists> <host that exists>:22
● Safely failed connecting to 'foobarfofofo': getaddrinfo ENOTFOUND foobarfofofo foobarfofofo:22
● Safely failed connecting to '<host that exists>': connect ENOENT process.env.SSH_AUTH_SOCK
✈ Flightplan finished after 2.23 s
● Error: This Fiber is not yielding
    at Client.<anonymous> ({path-to-my-project}/node_modules/flightplan/lib/transport/ssh.js:53:15)
    at emitOne (events.js:96:13)
    at Client.emit (events.js:191:7)
    at tryNextAuth ({path-to-my-project}/node_modules/ssh2/lib/client.js:296:12)
    at SSH2Stream.onUSERAUTH_FAILURE ({path-to-my-project}//node_modules/ssh2/lib/client.js:473:5)
    at emitTwo (events.js:106:13)
    at SSH2Stream.emit (events.js:194:7)
    at parsePacket ({path-to-my-project}/node_modules/ssh2-streams/lib/ssh.js:3647:10)
    at SSH2Stream._transform ({path-to-my-project}/node_modules/ssh2-streams/lib/ssh.js:551:13)
    at SSH2Stream.Transform._read (_stream_transform.js:167:10)