If one uses the Add button on the Campaigns page in order to create a campaign from scratch when one goes to edit the it via the GUI then the pre-created campaign and stage bubbles are missing several fields.
The campaign bubble when edited doesn't have the campaign_keywords field, data_handling_service, and output_ancestor_depth, and it does have a merge_overrides and default_clear_cronjob but in a different order in the list.
The campaign stage bubble when edited is missing the campaign_keywords and merge_overrides fields, but also the sam_settings field found in other campaigns -- this was tagged as a SAM campaign on creation.