I see your demonstration, the “sub-checklist” works fine in your example, but not in mine.
You see, when the first level “ordered list”, and the second level is unordered list, it works not very fine.
And, I usually write very long sentences, in that way, it will not be very clear like in your example (in your example, the checklists are very short, like a few words), so it will be not very clean without a “dot”.