spring-cloud-sleuth: MessageDeliveryException thrown when using AMQP backed channel with Brixton.SR7 and Camden

I am using an AMQP backed channel with Spring Boot 1.4.4.RELEASE and spring-cloud-dependencies. Up to Brixton.SR6, everything is working fine. The only thing I change in my project is Brixton.SR6 to Brixton.SR7 (note that I tried all Camden versions as well and I experienced the same issue) and I start getting:

org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException: Listener threw exception at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.wrapToListenerExecutionFailedExceptionIfNeeded(AbstractMessageListenerContainer.java:873)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:783)

Full details of the stack trace can be found at http://stackoverflow.com/questions/42277170/messagedeliveryexception-thrown-when-using-amqp-backed-channel-with-brixton-sr7

My payload is a serializable object and with debug on (in both cases, ie Brixton.SR6 and Brixton.SR7, I can see: o.s.messaging.MessageHeaders : Ignoring non-serializable message headers: [currentSpan, X-Current-Span]

The message I am trying to send to Action.FieldBackup can be seen below:

o.s.i.amqp.channel.PollableAmqpChannel   : preSend on channel 'Action.FieldBackup', message: GenericMessage [payload=uk.gov.ons.ctp.response.action.message.instruction.ActionInstruction@2868ea3c, headers={amqp_receivedDeliveryMode=PERSISTENT, amqp_receivedExchange=action-outbound-exchange, amqp_deliveryTag=394, X-Message-Sent=true, amqp_redelivered=true, messageSent=true, spanTraceId=15090187c236028f, spanId=8eff5c3a7c511e5b, amqp_receivedRoutingKey=Action.Field.binding, X-B3-SpanId=8eff5c3a7c511e5b, currentSpan=[Trace: 15090187c236028f, Span: 8eff5c3a7c511e5b, Parent: 15090187c236028f, exportable:false], X-B3-Sampled=0, X-B3-TraceId=15090187c236028f, id=8e4b81b8-17d0-1d15-d961-fe2b4d0e9cf5, amqp_consumerTag=amq.ctag-EXgeAZXQ5fGy8fUdHPdapQ, X-Current-Span=[Trace: 15090187c236028f, Span: 8eff5c3a7c511e5b, Parent: 15090187c236028f, exportable:false], spanSampled=0, contentType=text/xml, timestamp=1487262992385}]

My xml configuration can be found in the stackoverflow question as well.

If you need more details, I can put my full project code on github for you to have a look and replicate quickly.