I've got some code that creates a new management asset and adds metadata to that with various tags. However when I create the asset in contentful, I can see the asset correctly, but it has no tags. When I look at the json is sent up, I can't see the metadata fields. It looks like the WriteJson method in the ManagementAssetJsonConverter is not serialilizing the metadata fields. Am I doing something incorrectly? Can I not create an asset with tags already assigned?