When previewing TODO view items, only the top-level header and its contents are visible. That is, lower-level subsections (and there headings) are missing. This limits usable TODO items to be tree leaves (such that there are no lower-level branches).
Please make lower-level headers and their contents visible!
I'm not sure if this is a feature request or a bug report, but the app is functional without it, so I went with feature request.