I was a bit surprised to hear this, so I went and tested. If you just set a number list style in Bear, after a different style, it works exactly the same as Agenda and Notes. Ie it will revert to 1.
Bear seems to have the option to type in any number to start a list, so if you wanted to continue at 2, you could type 2. to keep going. Maybe that is what you mean. But the default behavior is to revert to 1.
MS Word I think is the same. By default it will go back to 1., but you can override it. But Word is not really a note taking app, it is a word processor, so it has more powerful editing features (at the cost of ease of use).
Anyway, thanks for the discussion. I learned something.