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make sure to also add

joint_state_publisher_gui_node = launch_ros.actions.Node( package="joint_state_publisher_gui", executable="joint_state_publisher_gui", name="joint_state_publisher_gui", condition=launch.conditions.IfCondition(LaunchConfiguration("gui")), )

into your launch file.

I am guessing this is because the continuous joint require some other node to publish its current positions

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