[Issue] Teacup posts lose title if the post is edited

I use Teacup for eat and drink posts. The posts come through from Teacup via micropub as Uncategorised posts without a hitch.
When I update the post from either the Edit Post page or through the Quick Edit option, the micropubbed post title vanishes. This happens for post titles/taxonomies/any edits that don’t touch the response properties section.