[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.
Examples:

• Test post 1: 20190813-0508 | view at Teacup
• Test post 2: test food post | view original at Teacup I changed the post title.