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I believe the issue is that in NODE 2 you're not providing a remote node name:

http://docs.ros2.org/bouncy/api/rclcpp/classrclcpp_1_1_sync_parameters_client.html#ad7d9189ce6b12fbe0d23890ed61bb928

(it's the second argument after the handle to the local node)

Basically that defaults to "" which implicitly means "this node", which I admit isn't very clear.

So yes, in NODE 2 you're listing parameters on yourself rather than NODE 1.

Try this change in NODE 2:

auto parameters_client = std::make_shared<rclcpp::SyncParametersClient>(node, "node_1");