Exports from Seneca async plugins do not get exported

[lilsweetcaligula]

async function async_plugin() {
  return { exports: { message: 'async' } }
}

function plugin() {
  return { exports: { message: 'sync' } }
}

Seneca()
  .use(plugin)
  .use(async_plugin)
  .ready(function () {
    const seneca = this

    console.log(Object.keys(seneca.private$.exports))
    // has 'plugin/message'
    // does not have 'async_plugin/message'
  })