Seneca3 problem with decorate in plugins and chained configuration

index.js

'use strict'


var plugin = require('./plugin');

require('seneca')({
  tag: 'repl',
  log: 'silent',
  legacy: { logging: false },
  debug: {short_logs:true}
})
.use(plugin)
.testDecoration()

package.json

{
  "name": "test_seneca",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "seneca": "^3.0.0"
  }
}

plugin.js

module.exports = function (options) {
  console.log('plugin init');

  this.decorate('testDecoration', function () {
    console.log('inside the decoration');
  });

  return {
    name: 'test plugin',
    options: options
  }
};