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You are using remap on a global scope. Try:

<launch>
  <node name="publiser" pkg="hwu_meta_data" type="publisher_node.py" />
  <node ns="subnamespace3" name="remapped_ns_subcriber"
        pkg="hwu_meta_data" type="subscriber_node.py" output="screen">
    <remap from="your_topic" to="/your_topic" />
  </node>
</launch>

This requires to explicitly remap each topic you use but in my opinion that's much cleaner anyway.

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