events not called when removeListener used inside callback

[john-dagger]

Im creating 2 separate message handlers for the same topic.
inside the first message handler it removes itself via removeListener() to imitate a once() call:

const mqEmitter = require('mqemitter');

function messageHandler1 (message, cb) {
  console.log('messageHandler1 called');
  // removes itself
  mqEmitter.removeListener('hello', messageHandler1);
  cb();
}

e.on('hello', messageHandler1)

function messageHandler2 (message, cb) {
  console.log('messageHandler2 called');
  cb();
}

mqEmitter.on('hello', messageHandler2);

mqEmitter.emit({ topic: 'hello' }, function () {
  console.log('emit callback called');
});

I would expect both of the handlers to be called and after that the emit callback.
so the expected output should be:

messageHandler1 called
messageHandler2 called
emit callback called

the second callback and the emit callback are newver called and the actual output is:

messageHandler1 called

I think the issue is that when emitting, fastparallel is given the same array instance that is used to hold (and remove for that matter) message handlers here: https://github.com/mcollina/mqemitter/blob/master/mqemitter.js#L121