From @naepalm: When loading properties for export/editing on a content node, if all nodes returned by the API have no value for that property, the property will not export to the CSV. The C# does a check for item.HasValue and adds it to the list. But if all pieces of content return false on that, it's never added.
From @naepalm: When loading properties for export/editing on a content node, if all nodes returned by the API have no value for that property, the property will not export to the CSV. The C# does a check for item.HasValue and adds it to the list. But if all pieces of content return false on that, it's never added.