There seems to be a problem working with sections that reside within section groups.
I had a Drafts action set to append to a page in a section that’s contained within a section group. Instead of adding to that page, it created a new page in a new section with the exact same name as the one I actually wanted. The new section is in the top level within the notebook, rather than in the section group.
If I move the intended section to the top level within the notebook (no longer within the section group), Drafts is able to add pages to it there, rather than creating more new sections with the same name (of course, in that case, the known issue with OneNote Append/Prepend functionality still remains).
Do you know if the problem finding an existing section within a section group is also due to problems on Microsoft’s end?