Cannot Create New Sermons

I’ve recently updated to WP 5.6 and suddenly I find I cannot add new sermons. When I tap “Add new” it does open the add new page, but it is missing several fields (all the fields from the left bar, ‘preachers’ ‘series’ ‘topics’ ‘Bible books’ ‘sermon image’) and I see a message near the top of the page that says “you are currently editing the page that shows your latest posts.”

Has anyone else encountered this and is there a solution? Editing existing sermons does open them up correctly with all the right fields, it’s just new sermons that are missing.

I’m a pro user with version 2.16.3