Missing sections headers

The issue is that the tool does not add the section headers, such as “node_type:”, “capability_types:”, etc It may be possible that it was doing that correctly before.

The list of headers may be found at https://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.3/os/TOSCA-Simple-Profile-YAML-v1.3-os.html#_Toc26969451