JMS Correlation ID is different in MQ - jms

Question

I'm writing a java spring boot app that connects to MQ, read messages (placed by another app) and returns a response to them.
I'm trying to set the correlation id to the message ID we've just received.
public void sendMessage(String destination, Item item, Message originalMessage) throws IOException {
jmsTemplate.send(destinationName, session -> {
Message message = createBytesMessage(item, session);
message.setJMSCorrelationID(originalMessage.getJMSMessageID());
log.info("Message: " + message);
return message;
});
}
The original message ID is:
ID:414d5120514d44454c30315020202020f8af4d6202558722
The reply message has a correlation ID as expected:
ID:414d5120514d44454c30315020202020f8af4d6202558722
However, when I investigate MQ I can see the correlation ID is actually:
343134643531323035313464343434353463333033313530
Curiously, if I take my expected value for the correlation and covert that to a hexdecimal, I get the following:
343134643531323035313464343434353463333033313530323032303230323066386166346436323032383338343232
// The first 48 characters match what is in MQ
Here is the debug information from the java application:
This is the original message:
JMSMessage class: jms_bytes
JMSType: null
JMSDeliveryMode: 1
JMSDeliveryDelay: 0
JMSDeliveryTime: 0
JMSExpiration: 0
JMSPriority: 0
JMSMessageID: ID:414d5120514d44454c30315020202020f8af4d6202558722
JMSTimestamp: 1649452421210
JMSCorrelationID: null
JMSDestination: null
JMSRedelivered: false
JMSXAppID: DataFlowEngine
JMSXDeliveryCount: 1
JMSXUserID: mqm
JMS_IBM_Character_Set: UTF-8
JMS_IBM_Encoding: 546
JMS_IBM_Format:
JMS_IBM_MsgType: 1
JMS_IBM_PutApplType: 6
JMS_IBM_PutDate: 20220408
JMS_IBM_PutTime: 21134121
This is the debug for the out bound message:
2022-04-08 22:13:42.020 DEBUG 31180 --- [enerContainer-1] o.springframework.jms.core.JmsTemplate : Sending created message:
JMSMessage class: jms_bytes
JMSType: null
JMSDeliveryMode: 2
JMSDeliveryDelay: 0
JMSDeliveryTime: 0
JMSExpiration: 0
JMSPriority: 4
JMSMessageID: null
JMSTimestamp: 0
JMSCorrelationID: ID:414d5120514d44454c30315020202020f8af4d6202558722
JMSDestination: null
JMSReplyTo: null
JMSRedelivered: false
7b22747261636b696e674964223a312c22737461747573223a2244454c495645524544222c226465
6c697665727944617465223a22323032322d30312d3031222c2274797065223a225345434f4e445f
434c415353227d