Multiple Route is consuming messages sequentially in apache camel 4.x , but its consuming parallel in camel 2.x

Question

We have multiple jms route defined in same route class. All the route is having more than 100 messages in activemq broker. In earlier version of camel (2.x), we can see the messages has been consumed parallely by all the defined route if the messages are available. But in camel 4.x , we can see the second route is consuming messages after completing the first route messages.

Please see the route example we using

from("jms:queue:A")
  .bean("insertToATable)
  .wireTap("jms:queue:B");

from("jms:queue:B")
   .bean("insertToBTable)
   .wireTap("jms:queue:C")

from("jms:queue:C")
   .bean("insertToCTable)
   .end();

Here we are loading 500 messages to queue A and its pushing to queue B. But queue B is waiting for to complete all the messages from queue A and started consuming. We want the queue B needs to consume messages as soon as it get. So all the route can process parallel. How we can achieve this camel 4.x?