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Hi,
the exceptions seems to be thrown here:
https://github.com/ros2/ros2cli/blob/6cbe07025506233120703bc88e6a2123615e2e97/ros2param/ros2param/verb/list.py#L113
It might be good to open an issue on ros2/ros2cli for that, because the service future returns None although there seems to be no exception set (None).
The reason for this behavior might be that the list_parameters service of the lifecycle nodes you are using is not running or not ready. In which state are the nodes, do they reach configured state?
In general I made the experience that the Nav2 stack is much more mature in ROS2 Galactic.
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