Recursive checkboxes does not trigger when creating new checkbox

```
[X] recursive checkboxes
[X] 1st item checked
[X] 2nd checked
[ ] newly created with "c" +tab does not trigger close checkbox on top
```

Reproduce the nested recursive-checkbox case described in the issue, including creating a checkbox with “c” followed by Tab. Trace the checkbox behavior from that interaction and confirm that the newly created unchecked item causes the parent checkbox to close as expected.

Written by the indexing model from the issue text.