Track List changes do not trigger checkbox callbacks

Repeatable: Always
Steps to repeat:
1. Set up a multi-level taxonomy vocabulary.
2. Set up a termreference tree field that uses has both the "cascading_selection" and "track_list" options.
3. Select a root folder checkbox on that field, causing the "cascading_selection" javascript to select the children.
3. Deselect that root folder using the track list.

Expected Results:
Children checkboxes should be deselected, as expected from the "cascading selection" option.

Actual Results:
Only the parent term gets deselected.