Text in the body of an Ellipsis story that is formatted as a header (H1, H2, H3 etc) does not appear in Websked at all. This is highly confusing, because it looks as if headers are missing entirely. Text in header formatting should appear, even if unformatted, in the Websked preview of a story.
This will be available in sandboxes this evening.
Thanks for the request -- we are planning to tackle this ticket within the next two months.