ros2 component_container yaml parsing

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Does the ros2 component_container use a different yaml file parser than a node that is launched with launch_ros.actions.Node?

I have a yaml file that contains a few parameters that works fine when the node is launched using a component_container. But, when I launch the node using its own main() executable and launch_ros.actions.Node, I get the following error:

[node-1]   'Couldn't parse params file: '--params-file /home/tom/ros2-packages/install/moog/share/moog/config/vehicle/base.yaml'. Error: Cannot have a value before ros__parameters at line 1, at /tmp/binarydeb/ros-eloquent-rcl-yaml-param-parser-0.8.4/src/parser.c:1491, at /tmp/binarydeb/ros-eloquent-rcl-0.8.4/src/rcl/arguments.c:471'

My yaml file does not contain a 'ros__parameters' line in it, which seems to be the format stated here: https://github.com/ros2/rcl/tree/mast...

But again, the yaml file is parsed just fine when using the component_container to launch.

If I add the ros__parameters line to the yaml file, then the parameters are not read properly when launching using component_container.

Any ideas?