Ros1_Bridge: Custom message pairing failed if those messages have non- identical names in ros1 and ros2

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I am developing simple publisher- subscriber with custom messages.

1. The name of custom message file is 'EgoData.msg' in ROS1 and 'Size.msg' in ROS2 workspace. I have done the mapping in yaml file as follows:

    ros1_package_name: 'ros1_test'
    ros1_message_name: 'EgoData'
    ros2_package_name: 'bridge_test'
    ros2_message_name: 'Size'
   
        fields_1_to_2:
         vehicleLength: 'length'
   

2. I have done all the necessary steps for bridging custom messages. After I run dynamic bridge, publisher and subscriber, I get following error:

   failed to create 1to2 bridge for topic '/chatter' with ROS 1 type 'ros1_test/EgoData' and ROS 2 type 'bridge_test/Size': No template specialization for the pair

3. For debugging, I also checked generated/bridge_test_factories.cpp, it does not show any mapping of ros1 to ros 2.

4. Now, if I keep the name of custom messages at ros1 and ros2 same, say, I make ROS1 message name as 'Size.msg', and then build-run necessary nodes - publisher, subscriber and bridge; the pairing gets successful:

   created 1to2 bridge for topic '/chatter' with ROS 1 type 'ros1_test/Size' and ROS 2 type 'bridge_test/Size' [INFO] [ros1_bridge]: Passing message from ROS 1 ros1_test/Size to ROS 2 bridge_test/Size (showing msg only once per type)

   I have seen example mapping_rules.yaml where, even though service names are different, I can see them paired when I print using "--print-pairs". But in my case it's not working for messages. So is it something like the name of custom messages which we want to bridge must be identical? Or do I need to do any extra steps other than mentioned in documentation for custom messages? Kindly let me know the probable finding.

Looking forward to the answer.