[Bug] The presence of `ol.contains-task-list li.task-list-item input.task-list-item-checkbox`s cause `h4 ul > li`s' `ul`s to be moved to the last entrant.

Similarly to [`issues/1857`](https://github.com/github/markup/issues/1857#issue-2456610906), checkboxed lists that contain CommonMark-adherent child list entries, without checkboxes, render in incorrect places. Consider:

#### This renders.

1. [ ] This renders.

1. [ ] This renders.

1. [ ] This renders.

#### This renders.

- This does not render.

- This does not render.

#### This renders.

1. [ ] This renders.

1. [ ] This renders.

1. [ ] This renders.

#### This renders.

This renders.

The markup of it is:

~~~Markdown
#### This renders.

1. [ ] This renders.

1. [ ] This renders.

1. [ ] This renders.

#### This renders.

- This does not render.

- This does not render.

#### This renders.

1. [ ] This renders.

1. [ ] This renders.

1. [ ] This renders.

#### This renders.

This renders.
~~~

It renders as expected in the previewer:

Previewed | Actual
-|-
|