Symfony version(s) affected: <=4.3.0

Description

Messages coming from non-symfony producers are rejected by the messenger:consume command:

2019-05-30T16:12:46+00:00 [warning] Message will not be retried because the SentStamp is missing and so the target sender cannot be determined.
2019-05-30T16:12:46+00:00 [critical] Rejecting App\Message\Foo  (removing from transport).

The error is a result of the Symfony\Component\Messenger\Exception\InvalidArgumentException thrown by RoutableMessageBus:

Envelope is missing a BusNameStamp and no fallback message bus is configured on RoutableMessageBus.

My expectation was the message would be routed to the fallback message bus.

How to reproduce

Publish a message outside of Symfony (i.e. from another system, or directly with RabbitMQ admin interface).

Run the messenger:consume command without specifying the --bus option.

Possible Solution

Either pass the routable message bus which is already registered on the service container, or pass the default message bus to the routable message bus that's created in the ConsumeMessagesCommand.

Additional context

The routable message bus is created directly by the ConsumeMessagesCommand:

It's inconsistent with the way the message bus is registered on the container: