Bull Queue events: can i emit events between bull processors holding references to each other's queues?

Question

I want to emit user defined events on Bull queue event emitter to be intercepted across Queues (and processors), but events appear not to work across processes.

I am using the Bull nestjs wrapper library but I think this is a Bull Queue issue not specific to nestjs wrappers.

Setup:

In my QueueA processor I am emitting two events on the QueueA event queue, one is intercepted in the same queue (processor) and one in another processor. A reference to the emitting queue is available to the receiving Queue to be able to call its .on function.

QueueA emits two events.

    const x = this.QueueA.emit('event:test-event', {
      message: 'internal',
    });
    const y = this.QueueA.emit('global:test-event', {
      message: 'global',
    });

I have injected a reference to QueueA into QueueB and register the QueueA event in the QueueB constructor:

    batchQueue.on('event:test-event', (message) => {
      trace('internal test event received', message);
    });
 

In QueueB processor I have injected a reference to QueueA and registered the following in the constructor

    queueA.on('global:test-event', (message) => {
      console.log('external test event received', message);
    });

The result is that the test-event fires in the QueueA event callback but the the global:test-event doesn't fire in QueueB.

Bulls assertion that prefixing 'global:' to events makes them visible between queues does not appear to work.