I have been pushing text notes in Markdown format from Drafts to DTTG for a while now. I all worked well with one exception: If there was a colon in the first line of the note body it arrived empty in DDTG.
When a Markdown note contains a colon (exception: a colon right at the beginning) in the first line of the note body DTTP prompts: “Dieses Markdown-Dokumet [sic!] enthält nur Metadaten und erscheint daher als leer” (in my rough translation: “This Markdown Document does contain only meta data and therefore is displayed as empty”).
The “as” is interesting: The note just seems to be empty. If tapped on Bearbeiten/Edit the (not rendered) content becomes visible. Again: The same in the DTP 3 beta. And as I have set up a Smart Rule in DTP 3 to automatically convert Markdown to RTF the pseudo-empty note automatically turns into a real empty one.